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diff --git a/biology.bib b/biology.bib
index 8185ab7..eeeed7e 100755
--- a/biology.bib
+++ b/biology.bib
@@ -212,3 +212,14 @@
   edition   = {},
   volume    = {},
 }
+
+@book{brentari2015,
+  title     = {Jakob von Uexküll: The Discovery of the Umwelt between Biosemiotics and Theoretical Biology},
+  author    = {Carlo Brentari (auth.)},
+  publisher = {Springer Netherlands},
+  isbn      = {978-94-017-9687-3, 978-94-017-9688-0},
+  year      = {2015},
+  series    = {Biosemiotics 9},
+  edition   = {1},
+  volume    = {},
+}