On a class of polynomials associated with the cliques in a graph and its applications.
On Arrangements of Jordan Arcs with Three Intersections per Pair.
On Catalan trees and the Jacobian conjecture.
On dissections of the n-cube
On information storage and retrieval systems
On number of commutative mappings from finite set into itself (Preliminary communication)
On optimal play in the game of Hex.
On the edge set of graphs of lattice paths.
On the number of genus one labeled circle trees.
On the number of monotonic functions from two-valued logic to -valued logic
One-pile misère Nim for three or more players.