http://ist.ksc.kwansei.ac.jp/~nishitani/Lectures/Kyoto/Exercise/SalesMan/Salesman.gif
http://ist.ksc.kwansei.ac.jp/~nishitani/Lectures/Kyoto/Exercise/SalesMan/salesman.html

http://www.sist.ac.jp/~kanakubo/research/evolutionary_computing/tabu_list.gif
http://www.sist.ac.jp/~kanakubo/research/evolutionary_computing/tabu_search.html

http://www.di.kagawa-nct.ac.jp/~matusita/Arena/graph-and-algorithm/fig/figD-1c.png
http://www.di.kagawa-nct.ac.jp/~matusita/Arena/graph-and-algorithm/pageD-1.html