圏とグラフ理論
- http://www.hindawi.com/getarticle.aspx?doi=10.1155/s0161171286000017
- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V00-42MW5DS-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e453fd97da57cc01f360d888e6753312
- http://portal.acm.org/citation.cfm?id=605291
- http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B75GV-4T5BWKX-10&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=a84a600a47cbc8100e2c5545f2c07bf1