共 3 条
[1]
Boruvka O., 1926, PRACE MORAVSKE PRIDO, V3
[2]
COURANT R, 1941, WHAT MATH, P374
[3]
Kruskal J. B., 1956, P AM MATH SOC, V7, P48, DOI [DOI 10.1090/S0002-9939-1956-0078686-7, 10.2307/2033241]