2 citations · 4 across the 3 of their papers we have counts for
3 papers
math.CO2015
T-partition systems and travel groupoids on a graph
Jung Rae Cho, Jeongmi Park, Yoshio Sano
The notion of travel groupoids was introduced by L. Nebeský in 2006 in connection with a study on geodetic graphs. A travel groupoid is a pair of a set and a binary operation $…
math.CO2013★ 2 cited
The double competition multigraph of a digraph
Jeongmi Park, Yoshio Sano
In this article, we introduce the notion of the double competition multigraph of a digraph. We give characterizations of the double competition multigraphs of arbitrary digraphs, l…
math.CO2013★ 2 cited
The niche graphs of interval orders
Jeongmi Park, Yoshio Sano
The niche graph of a digraph is the (simple undirected) graph which has the same vertex set as and has an edge between two distinct vertices and if and only if $N^+…