: Dividing a system into almost unidirectional blocks.
: On centrality functions of a graph.
: Canonical decompositions of symmetric submodular systems.
: Some common properties for regulizable graphs, edge-critical graphs and B-graphs.
: "Dualities" in graph theory and the related fields viewed from the metatheoretical standpoint.
: Homomorphisms of graphs and their global maps.
: Characterization of polyhex graphs as applied to chemistry.
: The two disjoint path problem and wire routing design.