%0 Journal Article %A Barbeau, Edward J. %T Subordinate and Pseudo-Subordinate Semi-Algebras %J Canadian journal of mathematics %D 1967 %P 212-224 %V 19 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-014-9/ %R 10.4153/CJM-1967-014-9 %F 10_4153_CJM_1967_014_9