Guillermo Durán Agustín Gravano Ross M. McConnell Jeremy Spinrad Alan Tucker Polynomial time recognition of unit circular-arc graphs. 67-78 2006 58 J. Algorithms 1 http://dx.doi.org/10.1016/j.jalgor.2004.08.003 db/journals/jal/jal58.html#DuranGMST06