In this paper, we continue to investigate the spectrum for {4}-GDDs of type
gu m1 with
m as small as possible. We determine, for each admissible pair (
g,
u), the minimum values of
m for which a {4}-GDD of type
gum1 exists with four possible exceptions.
Keywords group divisible designs - double group divisible designs
communicated by C. J. Colbourn
Gennian Ge-Researcher supported by NSFC Grant 10471127.
Alan C. H. Ling-Researcher supported by an ARO grant 19-01-1-0406 and a DOE grant.
classification Primary 05B05