@InCollection{zbMATH00140087,
Author = {S. J. {Gismondi} and E. R. {Swart}},
Title = {{A new type of 4-colour reducibility}},
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 = {0-919628-82-6/pbk},
Pages = {33--48},
Year = {1991},
Publisher = {Winnipeg: Utilitas Mathematica Publishing Inc.},
Language = {English},
MSC2010 = {05C15 05B30},
Zbl = {0764.05026}
}