中国科学院数学与系统科学研究院期刊网
On Retracts of Cartesian Product of Finite Posets
Yin Bin LEI(1); Mao Kang LUO(2)
Acta Mathematica Sinica, Chinese Series . 2008, (3): 523 -528 .  DOI: 10.12386/A2008sxxb0062