diff --git a/R/svyfgt.R b/R/svyfgt.R
index 0e56be5..1a8becd 100644
--- a/R/svyfgt.R
+++ b/R/svyfgt.R
@@ -37,7 +37,7 @@
 #'
 #' Y.G. Berger and C. J. Skinner (2003), Variance estimation for a low income proportion.
 #' \emph{Journal of the Royal Statistical Society: Series C (Applied Statistics)}, Vol. 52, No. 4, pp. 457-468.
-#' URL \url{https://doi.org/10.1111/1467-9876.00417}
+#' DOI \doi{10.1111/1467-9876.00417}
 #'
 #' Buhong Zheng (2001). Statistical inference for poverty measures with relative poverty lines.
 #' \emph{Journal of Econometrics}, Vol. 101, pp. 337-356.
diff --git a/R/svygeidec.R b/R/svygeidec.R
index 82372ce..e7e0693 100644
--- a/R/svygeidec.R
+++ b/R/svygeidec.R
@@ -25,7 +25,7 @@
 #'
 #' @references Anthony F. Shorrocks (1984). Inequality decomposition groups population subgroups.
 #' \emph{Econometrica}, v. 52, n. 6, 1984, pp. 1369-1385.
-#' URL \url{https://www.jstor.org/stable/1913511}.
+#' DOI \doi{10.2307/1913511}.
 #'
 #' Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 #' and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/R/svyjdiv.R b/R/svyjdiv.R
index 1e293ef..d2ab184 100644
--- a/R/svyjdiv.R
+++ b/R/svyjdiv.R
@@ -23,7 +23,7 @@
 #'
 #' @references Nicholas Rohde (2016). J-divergence measurements of economic inequality.
 #' J. R. Statist. Soc. A, v. 179, Part 3 (2016), pp. 847-870.
-#' URL \url{https://rss.onlinelibrary.wiley.com/doi/abs/10.1111/rssa.12153}.
+#' DOI \doi{10.1111/rssa.12153}.
 #'
 #' Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 #' and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/R/svyjdivdec.R b/R/svyjdivdec.R
index 8ef1765..e533157 100644
--- a/R/svyjdivdec.R
+++ b/R/svyjdivdec.R
@@ -24,11 +24,11 @@
 #'
 #' @references Anthony F. Shorrocks (1984). Inequality decomposition
 #' by population subgroups. \emph{Econometrica}, v. 52, n. 6, 1984, pp. 1369-1385.
-#' URL \url{https://www.jstor.org/stable/1913511}.
+#' DOI \doi{10.2307/1913511}.
 #'
 #' Nicholas Rohde (2016). J-divergence measurements of economic inequality.
 #' J. R. Statist. Soc. A, v. 179, Part 3 (2016), pp. 847-870.
-#' URL \url{https://rss.onlinelibrary.wiley.com/doi/abs/10.1111/rssa.12153}.
+#' DOI \doi{10.1111/rssa.12153}.
 #'
 #' Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 #' and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/R/svyrich.R b/R/svyrich.R
index 5f907cb..3f58571 100644
--- a/R/svyrich.R
+++ b/R/svyrich.R
@@ -26,7 +26,7 @@
 #' @seealso \code{\link{svyfgt}}
 #'
 #' @references Michal Brzezinski (2014). Statistical Inference for Richness Measures. \emph{Applied Economics},
-#' Vol. 46, No. 14, pp. 1599-1608, URL \url{https://dx.doi.org/10.1080/00036846.2014.880106}.
+#' Vol. 46, No. 14, pp. 1599-1608, DOI \doi{10.1080/00036846.2014.880106}.
 #'
 #' Andreas Peichl, Thilo Schaefer, and Christoph Scheicher (2010). Measuring richness and poverty: A micro data
 #' application to Europe and Germany. \emph{Review of Income and Wealth}, Vol. 56, No.3, pp. 597-619.
diff --git a/R/svywatts.R b/R/svywatts.R
index 2f56fb3..8166024 100644
--- a/R/svywatts.R
+++ b/R/svywatts.R
@@ -36,11 +36,11 @@
 #'
 #' Vijay Verma and Gianni Betti (2011). Taylor linearization sampling errors and design effects for poverty measures
 #' and other complex statistics. \emph{Journal Of Applied Statistics}, Vol.38, No.8, pp. 1549-1576,
-#' URL \url{https://dx.doi.org/10.1080/02664763.2010.515674}.
+#' DOI \doi{10.1080/02664763.2010.515674}.
 #'
 #' Anthony B. Atkinson (1987). On the measurement of poverty.
 #' \emph{Econometrica}, Vol.55, No.4, (Jul., 1987), pp. 749-764,
-#' URL \url{https://www.jstor.org/stable/1911028}.
+#' DOI \doi{10.2307/1911028}.
 #'
 #' Guillaume Osier (2009). Variance estimation for complex indicators
 #' of poverty and inequality. \emph{Journal of the European Survey Research
diff --git a/R/svywattsdec.R b/R/svywattsdec.R
index 9c1b28b..51e7abc 100644
--- a/R/svywattsdec.R
+++ b/R/svywattsdec.R
@@ -28,7 +28,7 @@
 #'
 #' @references McKinley L. Blackburn (1989). Poverty measurement: an index related to a Theil measure of inequality.
 #' \emph{Journal of Business & Economic Statistics}, Vol.7, No.4, pp. 475-481,
-#' URL \url{https://amstat.tandfonline.com/doi/abs/10.1080/07350015.1989.10509760}.
+#' DOI \doi{10.1080/07350015.1989.10509760}.
 #'
 #' Satya R. Chakravarty, Joseph Deutsch and Jacques Silber (2008).
 #' On the Watts multidimensional poverty index and its decomposition.
diff --git a/R/svyzenga.R b/R/svyzenga.R
index 349989c..1679c29 100644
--- a/R/svyzenga.R
+++ b/R/svyzenga.R
@@ -20,10 +20,10 @@
 #' @seealso \code{\link{svygini}}
 #'
 #' @references Lucio Barabesi, Giancarlo Diana and Pier Francesco Perri (2016). Linearization of inequality indices in the design-based framework. Statistics, 50(5), 1161-1172.
-#' URL \url{https://www.tandfonline.com/doi/pdf/10.1080/02331888.2015.1135924}.
+#' DOI \doi{10.1080/02331888.2015.1135924}.
 #'
 #' Matti Langel and Yves Tille (2012). Inference by linearization for Zenga's new inequality index: a comparison with the Gini index.
-#' Metrika, 75, 1093-1110. URL \url{https://doi.org/10.1007/s00184-011-0369-1}.
+#' Metrika, 75, 1093-1110. DOI \doi{10.1007/s00184-011-0369-1}.
 #'
 #' Matti Langel (2012). Measuring inequality in finite population sampling.
 #' PhD thesis: Universite de Neuchatel,
diff --git a/man/svyfgt.Rd b/man/svyfgt.Rd
index 4bb058e..f3fabe2 100644
--- a/man/svyfgt.Rd
+++ b/man/svyfgt.Rd
@@ -177,7 +177,7 @@ James Foster, Joel Greer and Erik Thorbecke (1984). A class of decomposable pove
 
 Y.G. Berger and C. J. Skinner (2003), Variance estimation for a low income proportion.
 \emph{Journal of the Royal Statistical Society: Series C (Applied Statistics)}, Vol. 52, No. 4, pp. 457-468.
-URL \url{https://doi.org/10.1111/1467-9876.00417}
+DOI \doi{10.1111/1467-9876.00417}
 
 Buhong Zheng (2001). Statistical inference for poverty measures with relative poverty lines.
 \emph{Journal of Econometrics}, Vol. 101, pp. 337-356.
diff --git a/man/svygeidec.Rd b/man/svygeidec.Rd
index 15fb3b3..bc4dc47 100644
--- a/man/svygeidec.Rd
+++ b/man/svygeidec.Rd
@@ -154,7 +154,7 @@ dbDisconnect( conn , shutdown = TRUE )
 \references{
 Anthony F. Shorrocks (1984). Inequality decomposition groups population subgroups.
 \emph{Econometrica}, v. 52, n. 6, 1984, pp. 1369-1385.
-URL \url{https://www.jstor.org/stable/1913511}.
+DOI \doi{10.2307/1913511}.
 
 Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/man/svyjdiv.Rd b/man/svyjdiv.Rd
index 0e1ab41..121825c 100644
--- a/man/svyjdiv.Rd
+++ b/man/svyjdiv.Rd
@@ -116,7 +116,7 @@ dbDisconnect( conn , shutdown = TRUE )
 \references{
 Nicholas Rohde (2016). J-divergence measurements of economic inequality.
 J. R. Statist. Soc. A, v. 179, Part 3 (2016), pp. 847-870.
-URL \url{https://rss.onlinelibrary.wiley.com/doi/abs/10.1111/rssa.12153}.
+DOI \doi{10.1111/rssa.12153}.
 
 Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/man/svyjdivdec.Rd b/man/svyjdivdec.Rd
index f77fcc5..95773c4 100644
--- a/man/svyjdivdec.Rd
+++ b/man/svyjdivdec.Rd
@@ -131,11 +131,11 @@ dbDisconnect( conn , shutdown = TRUE )
 \references{
 Anthony F. Shorrocks (1984). Inequality decomposition
 by population subgroups. \emph{Econometrica}, v. 52, n. 6, 1984, pp. 1369-1385.
-URL \url{https://www.jstor.org/stable/1913511}.
+DOI \doi{10.2307/1913511}.
 
 Nicholas Rohde (2016). J-divergence measurements of economic inequality.
 J. R. Statist. Soc. A, v. 179, Part 3 (2016), pp. 847-870.
-URL \url{https://rss.onlinelibrary.wiley.com/doi/abs/10.1111/rssa.12153}.
+DOI \doi{10.1111/rssa.12153}.
 
 Martin Biewen and Stephen Jenkins (2002). Estimation of Generalized Entropy
 and Atkinson Inequality Indices from Complex Survey Data. \emph{DIW Discussion Papers},
diff --git a/man/svyrich.Rd b/man/svyrich.Rd
index 7ec66c5..a1b4eae 100644
--- a/man/svyrich.Rd
+++ b/man/svyrich.Rd
@@ -168,7 +168,7 @@ dbDisconnect( conn , shutdown = TRUE )
 }
 \references{
 Michal Brzezinski (2014). Statistical Inference for Richness Measures. \emph{Applied Economics},
-Vol. 46, No. 14, pp. 1599-1608, URL \url{https://dx.doi.org/10.1080/00036846.2014.880106}.
+Vol. 46, No. 14, pp. 1599-1608, DOI \doi{10.1080/00036846.2014.880106}.
 
 Andreas Peichl, Thilo Schaefer, and Christoph Scheicher (2010). Measuring richness and poverty: A micro data
 application to Europe and Germany. \emph{Review of Income and Wealth}, Vol. 56, No.3, pp. 597-619.
diff --git a/man/svywatts.Rd b/man/svywatts.Rd
index dc72837..f6a55fb 100644
--- a/man/svywatts.Rd
+++ b/man/svywatts.Rd
@@ -160,11 +160,11 @@ Buhong Zheng (2001). Statistical inference for poverty measures with relative po
 
 Vijay Verma and Gianni Betti (2011). Taylor linearization sampling errors and design effects for poverty measures
 and other complex statistics. \emph{Journal Of Applied Statistics}, Vol.38, No.8, pp. 1549-1576,
-URL \url{https://dx.doi.org/10.1080/02664763.2010.515674}.
+DOI \doi{10.1080/02664763.2010.515674}.
 
 Anthony B. Atkinson (1987). On the measurement of poverty.
 \emph{Econometrica}, Vol.55, No.4, (Jul., 1987), pp. 749-764,
-URL \url{https://www.jstor.org/stable/1911028}.
+DOI \doi{10.2307/1911028}.
 
 Guillaume Osier (2009). Variance estimation for complex indicators
 of poverty and inequality. \emph{Journal of the European Survey Research
diff --git a/man/svywattsdec.Rd b/man/svywattsdec.Rd
index 938aa38..3fbd16d 100644
--- a/man/svywattsdec.Rd
+++ b/man/svywattsdec.Rd
@@ -141,7 +141,7 @@ dbDisconnect( conn , shutdown = TRUE )
 \references{
 McKinley L. Blackburn (1989). Poverty measurement: an index related to a Theil measure of inequality.
 \emph{Journal of Business & Economic Statistics}, Vol.7, No.4, pp. 475-481,
-URL \url{https://amstat.tandfonline.com/doi/abs/10.1080/07350015.1989.10509760}.
+DOI \doi{10.1080/07350015.1989.10509760}.
 
 Satya R. Chakravarty, Joseph Deutsch and Jacques Silber (2008).
 On the Watts multidimensional poverty index and its decomposition.
diff --git a/man/svyzenga.Rd b/man/svyzenga.Rd
index 365f4b4..5e754ae 100644
--- a/man/svyzenga.Rd
+++ b/man/svyzenga.Rd
@@ -113,10 +113,10 @@ dbDisconnect( conn , shutdown = TRUE )
 }
 \references{
 Lucio Barabesi, Giancarlo Diana and Pier Francesco Perri (2016). Linearization of inequality indices in the design-based framework. Statistics, 50(5), 1161-1172.
-URL \url{https://www.tandfonline.com/doi/pdf/10.1080/02331888.2015.1135924}.
+DOI \doi{10.1080/02331888.2015.1135924}.
 
 Matti Langel and Yves Tille (2012). Inference by linearization for Zenga's new inequality index: a comparison with the Gini index.
-Metrika, 75, 1093-1110. URL \url{https://doi.org/10.1007/s00184-011-0369-1}.
+Metrika, 75, 1093-1110. DOI \doi{10.1007/s00184-011-0369-1}.
 
 Matti Langel (2012). Measuring inequality in finite population sampling.
 PhD thesis: Universite de Neuchatel,