%0 Journal Article %A Cléroux, Robert %T On the Evaluation of Some Expressions Concerning the PBIB Designs %J Canadian mathematical bulletin %D 1968 %P 107-114 %V 11 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-014-6/ %R 10.4153/CMB-1968-014-6 %F 10_4153_CMB_1968_014_6