IV. REQUIREMENTS ON MODIFIED WORKS
    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.