diff --git a/opensym2017/spb.bib b/opensym2017/spb.bib
index ae7f103..b5a53c5 100644
--- a/opensym2017/spb.bib
+++ b/opensym2017/spb.bib
@@ -181,10 +181,11 @@
 @article{bobr2003,
   author = {Booch, Grady and Brown, Alan W.},
   journal = {Advances in Computers},
-  pages = {?},
+  pages = {1--27},
   title = {Collaborative Development Environments},
   volume = {59},
-  year = {2003}
+  year = {2003},
+  publisher={Elsevier}
 }
 
 @inproceedings{chao2007student,
@@ -194,8 +195,7 @@
   pages={255--261},
   year={2007},
   url = {http://dblp.uni-trier.de/db/conf/csee/csee2007.html},
-  publisher = {IEEE Computer Society},
-  organization={IEEE}
+  publisher = {IEEE Computer Society}
 }
 
 @inproceedings{tosi2015,
--
libgit2 0.21.2