%0 Journal Article %A Lambek, Joachim %T Subequalizers %J Canadian mathematical bulletin %D 1970 %P 337-349 %V 13 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-065-6/ %R 10.4153/CMB-1970-065-6 %F 10_4153_CMB_1970_065_6