diff --git a/app/models/journal_paper.rb b/app/models/journal_paper.rb
index 7f0e719..acf7ed3 100644
--- a/app/models/journal_paper.rb
+++ b/app/models/journal_paper.rb
@@ -63,6 +63,8 @@ class JournalPaper
     #   title << pd[0]
     # end
     title << self.year
+    title.delete(nil)
+    title.join(', ').gsub(', ,',',')
   end
 
   # def self.member_data