A heuristic procedure which has proven efficient at solving Combinatorial optimization problems.
References
Glover, F.; Taillard, E.; and De Werra, D. ``A User's Guide to Tabu Search.'' Ann. Oper. Res. 41, 3-28, 1993.
Piwakowski, K. ``Applying Tabu Search to Determine New Ramsey Numbers.'' Electronic J. Combinatorics 3, R6 1-4, 1996.
http://www.combinatorics.org/Volume_3/volume3.html#R6.