Ulrich Faigle, Alan J. Hoffman, et al.
SIAM Journal on Discrete Mathematics
It is well known that there are at most four Moore graphs of diameter 2, i.e., graphs of diameter 2, maximum degree d, and d2 + 1 vertices. The purpose of this paper is to prove that with the exception of C4, there are no graphs of diameter 2, of maximum degree d, and with d2 vertices. Copyright © 1980 Wiley Periodicals, Inc., A Wiley Company
Ulrich Faigle, Alan J. Hoffman, et al.
SIAM Journal on Discrete Mathematics
Alan J. Hoffman, Kate Jenkins, et al.
Information Processing Letters
Alan J. Hoffman
J. Comb. Theory Ser. A
Alan J. Hoffman, Baruch Schieber
Discrete Applied Mathematics