URN:NBN:SI:doc-90GM3ZY12011Zhu, Xudingdocuments/casopisje/ars-mathematica-contemporanea/16261209a.pdfdocuments/doc/9/URN_NBN_SI_doc-90GM3ZY1_001.pdfdocuments/doc/9/URN_NBN_SI_doc-90GM3ZY1_001.txt14articlestr. 25-27162612091855-3966URN:NBN:SI:doc-90GM3ZY1engDruštvo matematikov, fizikov in astronomov SlovenijeArs mathematica contemporaneaBYbarvanjechromatic numbercolouring numbergraph theorykromatično številoNP-completenessNP-polnostSzekeres-Wilf inequalityteorija grafovGraphs with chromatic numbers strictly less than their colouring numbers