共 6 条
[2]
Daif MN, 2010, ST PETERSB MATH J+, V21, P43
[4]
Vukman J., 1999, Comment. Math. Univ. Ca., V40, P447
[5]
Vukman J., 2001, Comment. Math. Univ. Carolin., V42, P237
[6]
Zalar B, 1991, Comment. Math. Univ. Carol, V32, P609