Etienne Grandjean Frédéric Olive Graph properties checkable in linear time in the number of vertices. 546-597 2004 68 J. Comput. Syst. Sci. 3 http://dx.doi.org/10.1016/j.jcss.2003.09.002 db/journals/jcss/jcss68.html#GrandjeanO04