diff --git a/governing the commons.md b/governing the commons.md
index 3fdfe3d76..895a6650f 100644
--- a/governing the commons.md	
+++ b/governing the commons.md	
@@ -2,4 +2,6 @@
 	- by [[elinor ostrom]]
 	- [[1990]]
 	- [[wp]] https://en.wikipedia.org/wiki/Special:BookSources/978-0-521-40599-7
-	- [[go]] https://books.google.ch/books?id=4xg6oUobMz4C&printsec=frontcover&dq=isbn:9780521405997&hl=en&sa=X&ved=2ahUKEwiU5ZfmhczwAhWEuaQKHVnnCEwQ6AEwAHoECAAQAg#v=onepage&q&f=false
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+	- [[hypothesis]] https://via.hypothes.is/https://www.actu-environnement.com/media/pdf/ostrom_1990.pdf
+		- [[go]] [[hypothesis]]
+	- [[google books]] https://books.google.ch/books?id=4xg6oUobMz4C&printsec=frontcover&dq=isbn:9780521405997&hl=en&sa=X&ved=2ahUKEwiU5ZfmhczwAhWEuaQKHVnnCEwQ6AEwAHoECAAQAg#v=onepage&q&f=false
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