Existentially closed BIBD block-intersection graphs.
Hamilton decompositions of line graphs of some bipartite graphs
Some bipartite Hamilton decomposable graphs that are regular of degree δ ≡ 2 (mod 4) are shown to have Hamilton decomposable line graphs. One consequence is that every bipartite Hamilton decomposable graph G with connectivity κ(G) = 2 has a Hamilton decomposable line graph L(G).
Properties of the Steiner triple systems of order 19.
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