共 5 条
[1]
Halin R., 1969, J COMB THEORY, V7, P150, DOI 10.1016/S0021-9800(69)80049-9
[2]
LICK D, 1969, LECTURES NOTES, P199
[4]
MADER W, TO BE PUBLISHED
[5]
Watkins M.E., 1970, J COMBIN THEORY, V8, P23