Extensions of Graceful Valuations of \(2\)-Regular Graphs Consisting of \(4\)-Gons

Jaromir Abrham1, Anton Kotzig2
1 Dept. of Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 1A4
2Département de mathématiques et de statistique, Université de Montréal, C.P. 6128, Succursale “A” Montréal, Québec, Canada H3C 337

Abstract