Olaf Krzikalla would like to thank:
    
- 
          Markus Schaaf for pointing out the possibility
          and the advantages of the derivation approach.
        
- 
          Udo Steinbach for encouragements to present
          this work for boost, a lot of fixes and helpful discussions.
        
- 
          Jaap Suter for the initial hint, which
          eventually lead to the member value_traits.
        
      Ion Gaztanaga would like to thank:
    
- 
          Olaf Krzikalla for the permission to continue
          his great work.
        
- 
          Joaquin M. Lopez Munoz for his thorough
          review, help, and ideas.
        
- 
          Cory Nelson, Daniel
          James, Dave Harris, Guillaume Melquiond, Henri
          Bavestrello, Hervé Bronnimann,
          Kai Bruning, Kevin
          Sopp, Paul Rose, Pavel Vozelinek, Howard Hinnant,
          Olaf Krzikalla, Samuel
          Debionne, Stjepan Rajko, Thorsten Ottosen, Tobias Schwinger,
          Tom Brinkman and Steven
          Watanabe for their comments and reviews in the Boost.Intrusive
          formal review.
        
- 
          Thanks to Julienne Walker and The EC Team (http://eternallyconfuzzled.com)
          for their great algorithms.
        
- 
          Thanks to Daniel K. O. for his AVL tree
          rebalancing code.
        
- 
          Thanks to Ralf Mattethat for his splay
          tree article and code.
        
- 
          Special thanks to Steven Watanabe and
          Tobias Schwinger for their invaluable
          suggestions and improvements.