diff --git a/main.bib b/main.bib
index 766c35a..89361cc 100644
--- a/main.bib
+++ b/main.bib
@@ -7804,8 +7804,9 @@
 @InProceedings{Pollard2011,
   author    = {Pollard, Carl and Smith, {E. Allyn}},
   booktitle = {Workshop on Projective Meaning, European Summer School on Logic, Language, and Information, Ljubljana, Slovenia, August 2011},
-  title     = {An alternative explanation for presupposition projection variability},
   date      = {2011},
+  title     = {An alternative explanation for presupposition projection variability},
+  pubstate  = {slides},
   keywords  = {semantics},
 }
 
@@ -7943,8 +7944,9 @@
 @InProceedings{Roberts2010,
   author    = {Roberts, Craige},
   booktitle = {Chicago Workshop on Semantics and Philosophy},
-  title     = {Retrievability and definite noun phrases},
   date      = {2010},
+  title     = {Retrievability and definite noun phrases},
+  pubstate  = {manuscript},
   keywords  = {semantics},
 }