Jürgen Herzog Satoshi Murai Xinxian Zheng Takayuki Hibi Ngô Viêt Trung Kruskal-Katona type theorems for clique complexes arising from chordal and strongly chordal graphs. 315-323 2008 28 Combinatorica 3 http://dx.doi.org/10.1007/s00493-008-2319-8 db/journals/combinatorica/combinatorica28.html#HerzogMZHT08