Celebratio Mathematica

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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

P. Baum, A. Connes, and N. Hig­son: “Clas­si­fy­ing space for prop­er ac­tions and $K$-the­ory of group $C^{\ast }$-al­geb­ras,” pp. 241–​291 in $C^{\ast }$-al­geb­ras: 1943–1993 (San Ant­o­nio, TX, 13–14 Janu­ary 1993). Edi­ted by R. S. Dor­an. Con­tem­por­ary Math­em­at­ics 167. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1994. MR 1292018 Zbl 0830.​46061 incollection