Celebratio Mathematica

P. Baum and J. Block: “Equivari­ant bi­cycles on sin­gu­lar spaces,” C. R. Acad. Sci. Par­is Sér. I Math. 311 : 2 (1990), pp. 115–​120. MR 1065441 Zbl 0719.​19003 article

P. Baum and J. Block: “Ex­cess in­ter­sec­tion in equivari­ant bivari­ant \( K \)-the­ory,” C. R. Acad. Sci. Par­is Sér. I Math. 314 : 5 (1992), pp. 387–​392. With abridged French ver­sion. MR 1153721 Zbl 0762.​19008 article