Letter, J. Plesnik->A.P. Ershov, 09.08.1978
Letter, A.P. Ershov->J. Plesnik, 24.08.1978
Letter, A.P. Ershov->B. A. Trakhtenbrot, 24.08.1978
Article, 21.08.1978"The NP-completeness of the hamiltonian cycle problem in planar digraphs with degree bound two" by J.Plesnik.
Referee's report, 04.09.1978
Card, 19.12.1978
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