Celebratio Mathematica

P. Baum and A. Connes: “$K$-the­ory for dis­crete groups,” pp. 1–​20 in Op­er­at­or al­geb­ras and ap­plic­a­tions (War­wick, UK, 20–25 Ju­ly 1987), vol. 1: Struc­ture the­ory; $K$-the­ory, geo­metry and to­po­logy. Edi­ted by D. Evans and M. Take­saki. Lon­don Math­em­at­ic­al So­ci­ety Lec­ture Note Series 135. Cam­bridge Uni­versity Press, 1988. MR 996437 Zbl 0685.​46041 incollection