1. Annals of Mathematics Studies, No. 46;Borel, Armand,1960
2. Orientation in generalized manifolds and applications to the theory of transformation groups;Bredon, Glen E.;Michigan Math. J.,1960
3. Some theorems on transformation groups;Bredon, Glen E.;Ann. of Math. (2),1958
4. Orbits of highest dimension;Montgomery, D.;Trans. Amer. Math. Soc.,1958