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diff --git a/notes.bib b/notes.bib
index 7523938..785cf1e 100644
--- a/notes.bib
+++ b/notes.bib
@@ -138,3 +138,14 @@
   isbn      = {978-1-60558-047-0},
   bibsource = {DBLP, http://dblp.uni-trier.de}
 }
+
+@article{sm,
+  title={Adjustment of an inverse matrix corresponding to a change in one element of a given matrix},
+  author={Sherman, J. and Morrison, W.J.},
+  journal={The Annals of Mathematical Statistics},
+  volume={21},
+  number={1},
+  pages={124--127},
+  year={1950},
+  publisher={JSTOR}
+}