Pairwise sequence comparison

References:

[1] Waterman (1993)

[2] Needleman, S.B. and Wunsch, Ch.D. (1970) 
	A general method applicable to the search for 
	similarities in the amino acid sequence of two proteins.
	J. Mol. Biol., 48, 443-453.

[3] Sankoff, D. (1972) 
	Matching Sequences under Deletion/Insertion 
	Constraints. 
	Proc. Natl. Acad. Sci. USA, 69, 4-6.

[4] Sellers, P.H. (1974) 
	On the Theory and Computation of Evolutionary
	Distances. SIAM J. Appl. Math., 26, 787-793.

[5] Gotoh, O. (1982) 
	An Improved Algorithm for Matching Biological Sequences. 
	J. Mol. Biol., 162, 705-708.

[6] Miller, W. and Myers E.W.
	Sequence comparison with concave weighting functions
	bull-math-biol., p. 97--120, 50-2