ISSN 1234-3099 (print version)
ISSN 2083-5892 (electronic version)
SCImago Journal Rank (SJR) 2018: 0.763
Rejection Rate (2018-2019): c. 84%
Discussiones Mathematicae Graph Theory 23(2) (2003) 325-332
Department of Applied MathematicsandInstitute for Theoretical Computer Science (ITI)Charles UniversityMalostranské nám.25, 11800 Praha 1, Czech Republice-mail: firstname.lastname@example.org
Department of Mathematics and StatisticsUniversity of ReginaRegina SK, S4S 0A2, Canadae-mail: email@example.com
Keywords: chromatic number, homomorphism duality.
2000 Mathematics Subject Classification: 05C15 (primary: graph coloring) 68R05 (secondary: combinatorics).
Received 3 May 2002Revised 27 June 2002
1Partially supported by the Project LN00A056 of the Czech Ministery of Education and by GAUK 158 grant.2This
research was done while the second author was visiting the Institute for Theoretical Computer Science (ITI) in the fall of 2000. The support of DIMATIA is gratefully acknowledged.