@Book{1987109260,
author="Roberts, Ian T.
and D'Arcy, Sue
and Egan, Judith
and Gr{\"u}ttm{\"u}ller, Martin",
title="An  improved bound on the cardinality of the minimal pairwise balanced designs on 18 points with maximum block size 4",
series="Preprints aus dem Institut f{\"u}r Mathematik",
year="2005",
address="Germany; Rostock",
abstract="The cardinality of the minimal pairwise balanced designs on v elements with largest block size k is denoted by g(k)(v). It is known that 31 <= g(4)(18) <= 33. In this paper we show that g(4)(18) =/ 31. <eng>",
note="Ian T. Roberts, Sue D'Arcy, Judith Egan, Martin Gr{\"u}ttm{\"u}ller",
doi="10.18453/rosdok_id00005893",
url="https://purl.uni-rostock.de/rosdok/id00005893",
url="https://doi.org/10.18453/rosdok_id00005893",
language="English"
}