Chromatic Sums of Biloopless Nonseparable Near-Triangulations on the Projective Plane

Zhao-xiang Li, Yan-pei Liu, Bing-feng Si

Acta Mathematicae Applicatae Sinica(English Series) . 2013, (1): 123 -134 . DOI: 10.1007/s10255-013-0197-3