%0 Journal Article %A Kelly, David %T The 3-Irreducible Partially Ordered Sets %J Canadian journal of mathematics %D 1977 %P 367-383 %V 29 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-040-3/ %R 10.4153/CJM-1977-040-3 %F 10_4153_CJM_1977_040_3