中国科学院数学与系统科学研究院期刊网
Chromatic and Dichromatic Sums of General Maps on the Plane
Zhao Xiang LI(1),Yan Pei LIU(2
Acta Mathematica Sinica, Chinese Series . 2004, (3): 487 -494 .  DOI: 10.12386/A2004sxxb0061