1. Möbius inversion in lattices;Crapo;Arch. Math.,1968
2. On the Foundations of Combinatorial Theory: Combinatorial Geometries;Crapo,1970
3. On the foundations of combinatorial theory IV. Finite vector spaces and Eulerian generating functions;Goldman;Stud. Appl. Math.,1970
4. The Rédei function of a relation;Kung;J. Combin. Theory Ser. A,1980
5. Critical problems;Kung,1996