Template:Baum&Connes&Higson1994
From Manifold Atlas
P. Baum, A. Connes and N. Higson, Classifying space for proper actions and -theory of group -algebras, In -algebras: 1943–1993 (San Antonio, TX 1993), (1994), 240–291. MR1292018 (96c:46070) Zbl 0830.46061