共 5 条
- [1] BOFFA M, 1991, CR ACAD SCI I-MATH, V313, P909
- [2] ENDIMIONI G, 1989, CR ACAD SCI I-MATH, V308, P75
- [3] GRUENBERG KW, 1953, P CAMB PHILOS SOC, V49, P377
- [4] KAPLANSKY I, 1971, CHICAGO LECTURES MAT
- [5] VAUGHANLEE M, 1990, LONDON MATH SOC MONO