共 6 条
[1]
KRIZKOVA J, 1974, COMMENT MATH U CAROL, V15, P611
[2]
PTAK V, 1974, CR ACAD SCI A MATH, V278, P1091
[4]
PTAK V, 1959, CZECH MATH J, V84, P523
[5]
PTAK V, 1974, CZECH MATH J, V99, P503
[6]
ZEMANEK J, 1975, CAS PEST MAT, V100, P176