collaboration institutions

[yangly]

Dear friends,
I am a PHD student at the Chinese National Academy in Beijing.  I am trying to find papers that discuss bibliometric studies of collaboration among institutions.  There are many papers that discuss collaboration of authors, but I can't find any that talk about institutions.  Does anyone know of any papers about that topic? wish to your reply, Thanks,   
Best regards,                     
                          
                        LiYing Yang, Beijing.
 

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