中国科学院数学与系统科学研究院期刊网
1-planar Graphs without 4-cycles or 5-cycles are 5-colorable
Li-li SONG, Lei SUN
Acta Mathematicae Applicatae Sinica(English Series) . 2022, (1): 169 -176 .  DOI: 10.1007/s10255-022-1073-9