共 5 条
[1]
ELSPAS B, 1965, INVESTIGATION PROPAG
[2]
GEWIRTZ A, IN PRESS
[4]
ORE O, 1962, 38 AM MATH SOC COLL
[5]
Singleton R.C., 1966, J COMB THEORY, V1, P306, DOI DOI 10.1016/S0021-9800(66)80054-6