1. and , Graph Theory With Applications, MacMillan, London (1976).
2. Edge-disjoint branchings. In Combinatorial Algorithms, Ed. Academic, New York (1973), pp. 91–96.
3. On disjoint trees and arborescences. In Algebraic Methods in Graph Theory, ász and V. T. Sós, Eds. North-Holland, Amsterdam (1981), pp. 159–169.
4. The maximum number of arc-disjoint arborescences in a tournament