Docs: add a new citing paper!

docs/citing_papers.bib

@@ -137,4 +137,15 @@ @article{Gehl2024
   year = {2024},
   month = feb,
   pages = {98–117}
-}
+}
+@article{Shearer2024,
+  title = {Earthquake Source Spectra Estimates Vary Widely for Two Ridgecrest Aftershocks Because of Differences in Attenuation Corrections},
+  ISSN = {1943-3573},
+  url = {http://dx.doi.org/10.1785/0120240134},
+  DOI = {10.1785/0120240134},
+  journal = {Bulletin of the Seismological Society of America},
+  publisher = {Seismological Society of America (SSA)},
+  author = {Shearer,  Peter M. and Vandevert,  Ian and Fan,  Wenyuan and Abercrombie,  Rachel E. and Bindi,  Dino and Calderoni,  Giovanna and Chen,  Xiaowei and Ellsworth,  William and Harrington,  Rebecca and Huang,  Yihe and Knudson,  Trey and Roßbach,  Meggy and Satriano,  Claudio and Supino,  Mariano and Trugman,  Daniel T. and Yang,  Hongfeng and Zhang,  Jiewen},
+  year = {2024},
+  month = dec
+}