On k-closure operators in graphs. II
On k-regular graphs containing (k-1)-regular subgraphs
On lattices determined up to isomorphisms by their graphs
On magic graphs
On magic labellings of type for three classes of plane graphs
On mapping graphs and permutation graphs
On Marczewski-Steinhaus type distance between hypergraphs
On minimal graphs of diameter with every edge in a -cycle
On minimal semirigid relations
On multilattices with isomorphic graphs
On pancyclic line graphs
On Partially Directed Eulerian Multigraphs
On partially directed geodetic graphs
On partition graphs and generalizations of line graphs
On pendant vertices in random graphs
On permutations in bipartite graphs
On planarity of graphs in 3-manifolds.
On polynomial time decidability of induced-minor-closed classes
On prime factors of sums of integers III
On Principal Graphs and Weak Duality.