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Donovan, D. M. and Grannell, M. J.
(2011).
DOI: https://doi.org/10.1007/s10623-010-9429-1
Abstract
Two constructions are described that yield an improved lower bound for the number of 2-designs with the parameters of PGd(n,q), and a lower bound for the number of resolved 2-designs with the parameters of AGd(n,q).