diff -r 995d4c99843d -r 565f82b8ff9c vendor/plugins/redmine_bibliography/app/models/publication.rb
--- a/vendor/plugins/redmine_bibliography/app/models/publication.rb
+++ b/vendor/plugins/redmine_bibliography/app/models/publication.rb
@@ -4,7 +4,7 @@
   unloadable
   
   has_many :authorships
-  has_many :authors, :through => :authorships
+  has_many :authors, :through => :authorships, :uniq => true
   
   has_one :bibtex_entry, :dependent => :destroy