On Steiner manifolds
Remarks on the Cartesian product of two graphs
On the problem of existence of finite regular planes
Remarks on finite regular planes
Remarks on algebras and regular finite planes
On hypergraphs of maximal simple paths of a class of Hamiltonian graphs
Uwagi o charakteryzacji prostej wśród grafów na powierzchniach niezwartych
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Pewna charakteryzacja prostej wśród grafów płaskich
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Remarques sur la construction des graphes symetriques
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