Update README.md

bjmorgan · Feb 22, 2023 · e632344 · e632344
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 If you use `py-sc-fermi` in your work, please consider citing the following: 
 - the [paper](https://joss.theoj.org/papers/10.21105/joss.04962) associated with the `py-sc-fermi`
-- the [paper]() associated with the FORTRAN code [`SC-Fermi`](https://github.com/jbuckeridge/sc-fermi) on which this code was initially based, which provides an excellent discussion of the underlying theory. 
+- the [paper](https://www.sciencedirect.com/science/article/pii/S0010465519302048) associated with the FORTRAN code [`SC-Fermi`](https://github.com/jbuckeridge/sc-fermi) on which this code was initially based, which provides an excellent discussion of the underlying theory.