1. B. Bollobás,Extremal Graph Theory, Academic Press, London 1978.
2. R. Diestel, On Universal Graphs With Forbidden Topological Subgraphs, to appear inEurop. J. Combinatorics.
3. R. Diestel, On the Problem of Finding Small Subdivision and Homomorphism Bases for Classes of Countable Graphs, to appear inDiscrete Math.
4. R. Diestel, Simplicial Decompositions of Graphs — Some Uniqueness Results, submitted.
5. R. Halin,Graphentheorie II, Wissenschaftliche Buchgesellschaft, Darmstadt 1981.