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[2] Pavel PUDLÁK: Representations of finite lattices. (in Czech), CSc dissertation, Mathematical Institute of the Czechoslovak Academy of Sciences, Prague, 1978.

[3] V. Neumann, Lara: $k$-Hamiltonian graphs with given girth. Coll. Math. Soc. János Bolyai, Infinite and Finite Sets, Keszthely, 1973, 1133-1140. MR 0379282