| This work is based on algorithms developed by 
  D. E. Knuth, The Art of Computer Programming, 
    Vol. 3, Sorting and Searching, Addison–Wesley, 
  
  Robert Sedgewick, Left-leaning Red-Black Trees
    (http://www.cs.princeton.edu/~rs/talks/LLRB/LLRB.pdf)
  Robert Sedgewick, 2008 International Conference on the Analysis of Algorithms in Maresias, Brazil 
    (http://www.ime.usp.br/~cris/AofA2008/slides/sedgewick.pdf)
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