1. Induced subsets;Bondy;J. Combin. Theory Ser. B,1972
2. A simple proof of the Kruskal-Katona theorem;Daykin;J. Combin. Theory Ser. A,1974
3. Optimization for order ideals under a weight assignment;Katona,1978
4. A theorem of finite sets;Katona,1966
5. The number of simplices in a complex;Kruskal,1963