@InCollection{zbMATH00139904,
Author = {Jaromir {Abrham}},
Title = {{Extensions of graceful valuations of 2-regular bipartite graphs.}},
BookTitle = {{Proceedings of the twenty-second southeastern conference on combinatorics, graph theory, and computing, held at Louisiana State University, Baton Rouge, LA, USA, February 10-15, 1991}},
ISBN = {0-919628-84-2/pbk},
Pages = {51--59},
Year = {1991},
Publisher = {Winnipeg: Utilitas Mathematica Publishing Inc.},
Language = {English},
MSC2010 = {05C78},
Zbl = {0766.05073}
}