中国科学院数学与系统科学研究院期刊网
AMS
L-fuzzy Roughness of n-ary Polygroups
Yun Qiang YIN, Jian Ming ZHAN, P. CORSINI
Acta Mathematica Sinica . 2011, (1): 97 -118 .  DOI: 10.1007/s10114-011-9465-4