A generalization of a result of Häggkvist and Nicoghossian.

Sun, 01 Jan 1989 00:00:00 +0100

Douglas Bauer, Hajo Broersma , Henk Jan Veldman, Li Rao:
A generalization of a result of Häggkvist and Nicoghossian. J. Comb. Theory B 47(2): 237-243 (1989)