\input zb-basic
\input zb-ioport
\iteman{io-port 03823846}
\itemau{Dutton, R.D.; Brigham, R.C.}
\itemti{A characterization of competition graphs.}
\itemso{Discrete Appl. Math. 6, 315-317 (1983).}
\itemcc{}
\itemut{competition graphs; competition relation; complete subgraphs; isolated vertices}
\itemli{doi:10.1016/0166-218X(83)90085-9}
\end