David B. Chandler Maw-Shang Chang Ton Kloks Jiping Liu Sheng-Lung Peng Partitioned probe comparability graphs. 212-222 2008 396 Theor. Comput. Sci. 1-3 http://dx.doi.org/10.1016/j.tcs.2008.01.038 db/journals/tcs/tcs396.html#ChandlerCKLP08