海量图书期刊资源，随时随地畅享阅读乐趣
On the number of unique subgraphs of a graphA.E Brouwer · 1975
On the number of unique subgraphs of a graphR.C Entringer; Paul Erdös · 1972
On tactical configurations with no four-cyclesFrank Harary; Allen J Schwenk · 1976