diff --git a/bibliografia.bib b/bibliografia.bib
index 0251ece..14b5955 100644
--- a/bibliografia.bib
+++ b/bibliografia.bib
@@ -93,4 +93,21 @@
 	author = {Decker, Wolfram and Greuel, Gert-Martin and Pfister, Gerhard and Sch\"onemann, Hans},
 	year = {2024},
 	howpublished = {\url{http://www.singular.uni-kl.de}},
+}
+
+@incollection {terao,
+    AUTHOR = {Terao, Hiroaki},
+     TITLE = {The exponents of a free hypersurface},
+ BOOKTITLE = {Singularities, {P}art 2 ({A}rcata, {C}alif., 1981)},
+    SERIES = {Proc. Sympos. Pure Math.},
+    VOLUME = {40},
+     PAGES = {561--566},
+ PUBLISHER = {Amer. Math. Soc., Providence, RI},
+      YEAR = {1983},
+      ISBN = {0-8218-1466-4},
+   MRCLASS = {32B30 (05A15 52A99)},
+  MRNUMBER = {713280},
+MRREVIEWER = {Louis\ Solomon},
+       DOI = {10.1090/pspum/040.2/713280},
+       URL = {https://doi.org/10.1090/pspum/040.2/713280},
 }
\ No newline at end of file