%0 Journal Article
%A Colbourn, Charles J.
%A Rosa, Alexander
%A Stinson, Douglas R.
%T Pairwise Balanced Designs with Block Sizes Three and Four
%J Canadian journal of mathematics
%D 1991
%P 673-704
%V 43
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1991-039-9/
%R 10.4153/CJM-1991-039-9
%F 10_4153_CJM_1991_039_9