diff --git a/thesis.bib b/thesis.bib
index 117c509..870ec72 100644
--- a/thesis.bib
+++ b/thesis.bib
@@ -2401,7 +2401,8 @@
   author    = {Nikolaos S. Papspyrou},
   title     = {A resumption monad transformer and its applications in the semantics of concurrency},
   booktitle = {Proceedings of the 3rd Panhellenic Logic Symposium},
-  address   = {Anogia, Greece}
+  address   = {Anogia, Greece},
+  year      = 2001,
 }
 
 @inproceedings{Harrison06,