共 17 条
[5]
Fort MK., 1951, PUBL MATH-DEBRECEN, V2, P100, DOI [DOI 10.5486/PMD.1951.2.2.03, 10.5486/PMD.1951.2.2.03]
[9]
KENDEROV PS, 1984, P OB C PAR OPT BIRK, P203