Graphs and hypergraphs (North-Holland mathematical library, v. 6) 1973 · ENGLISH · DJVU View details →
Topological Spaces: Including a Treatment of Multi-Valued Functions, Vector Spaces and Convexity ENGLISH · PDF View details →
Topological Spaces: Including a Treatment of Multi-Valued Functions, Vector Spaces and Convexity 1997 · ENGLISH · PDF View details →
Combinatorial Mathematics, Proceedings of the International Colloquium on Graph Theory and Combinatorics 1983 · ENGLISH · PDF View details →
