中国科学院数学与系统科学研究院期刊网
AMS
Infimum Properties Differ in the Weak Truth-table Degrees and the Turing Degrees
Liang YU, De Cheng DING
Acta Mathematica Sinica . 2004, (1): 163 -168 .  DOI: 10.1007/s10114-003-0288-9