Dafik, Mirka Miller, Costas Iliopoulos and Zdenek Ryjacek (The University of Newcastle Australia, 2007-11-05)
Since Moore digraphs do not exist for k /= 1 and d /= 1,
the problem of finding the existence of digraph of out-degree d >= 2
and diameter k >= 2 and order close to the Moore bound becomes an
interesting problem. To ...