%0 Journal Article %A Fegan, H. D. %A Steer, B. %T First Order Operators on Manifolds With a Group Action %J Canadian journal of mathematics %D 1996 %P 758-776 %V 48 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1996-039-6/ %R 10.4153/CJM-1996-039-6 %F 10_4153_CJM_1996_039_6