海量图书期刊资源,随时随地畅享阅读乐趣
Embeddings of one kind of graphsLiu Ying; Liu Yanpei · 1997
A characterization of embeddability of graphs on surfacesLiu Ying; Liu Yanpei · 1998
A census of boundary cubic rooted planar mapsWenzhong Liu; Yanpei Liu; Yan Xu · 2007
STRONG EMBEDDINGS OF PLANAR GRAPHS ON HIGHER SURFACESLiu, Tongyin; Liu, Yanpei · Acta Mathematica Scientia · 2002
LOWER BOUND NUMBER OF IRREDUCIBLE GRAPHS ON SURFACESLiu, Ying; Liu, Yanpei · Acta Mathematica Scientia · 1998
Enumeration of three kinds of rooted maps on the klein bottleWenzhong Liu; Yanpei Liu · 2007
Maximum Genus, Girth and ConnectivityDeming Li; Yanpei Liu · 2000
Enumeration on Nonseparable Planar MapsJunliang Cai; Yanpei Liu · 2002