1. Combinatorial Matrix Theory;Brualdi,1991
2. A sufficient condition for a tree belonging to T(2,2,n);Cho;Congr. Numer.,1997
3. The m-step competition graph of a digraph;Cho;Discrete Appl. Math.,2000
4. H.H. Cho, S.-R. Kim, Y. Nam, On the connected triangle-free graphs whose 2-step competition numbers are two, submitted for publication.
5. Interval graphs and food webs;Cohen,1968