Pairs of disjoint -element subsets far from each other.
Page 1
Enomoto, Hikoe, Katona, Gyula O.H. (2001)
The Electronic Journal of Combinatorics [electronic only]
Olof Heden (1974)
Mathematica Scandinavica
Michel Broué, Michel Enguehard (1972)
Annales scientifiques de l'École Normale Supérieure
Page 1