共 3 条
[1]
Ford L.R., 1956, CAN J MATH, V8, P399, DOI [10.4153/CJM-1956-045-5, DOI 10.4153/CJM-1956-045-5]
[3]
SEYMOUR PD, 1981, P LOND MATH SOC, V42, P178