中国科学院数学与系统科学研究院期刊网
Erdos-Ko-Rado Theorems of Labeled Sets
Xing-bo GENG, Yu-shuang LI
Acta Mathematicae Applicatae Sinica(English Series) . 2012, (1): 127 -130 .  DOI: 10.1007/s10255-012-0128-8