URN:NBN:SI:doc-T7G62DNH2013Hubička, JanJost, JürgenLong, YangjingStadler, Peter F.Yang, Lingdocuments/casopisje/ars-mathematica-contemporanea/16706393a.pdfdocuments/doc/T/URN_NBN_SI_doc-T7G62DNH_001.pdfdocuments/doc/T/URN_NBN_SI_doc-T7G62DNH_001.txt26articlestr. 323-350167063931855-3966URN:NBN:SI:doc-T7G62DNHengDruštvo matematikov, fizikov in astronomov SlovenijeArs mathematica contemporaneaBYbinary relationcocoregeneralized surjective graph homomorphismmultihomomorphismR-coreR-reduced graphR-retractionteorija grafov