%0 Journal Article
%A E. Victor Flynn
%A Joseph L. Wetherell
%T Covering collections
and a challenge problem of Serre
%J Acta Arithmetica
%D 2001
%P 197-205
%V 98
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/aa98-2-9/
%R 10.4064/aa98-2-9
%G en
%F 10_4064_aa98_2_9