All modified versions of documents covered by this license, including
    translations, anthologies, compilations and partial documents, must meet
    the following requirements:
   
    
- 
       The modified version must be labeled as such.
       
- 
       The person making the modifications must be identified and the
       modifications dated.
       
- 
       Acknowledgement of the original author and publisher if applicable must
       be retained according to normal academic citation practices.
       
- 
       The location of the original unmodified document must be identified.
       
- 
       The original author's (or authors') name(s) may not be used to assert
       or imply endorsement of the resulting document without the original
       author's (or authors') permission.