Celebratio Mathematica

P. Baum and A. Connes: “Leaf­wise ho­mo­topy equi­val­ence and ra­tion­al Pon­trja­gin classes,” pp. 1–​14 in Fo­li­ations (Tokyo, 14–18 Ju­ly 1983). Edi­ted by I. Tamura. Ad­vanced Stud­ies in Pure Math­em­at­ics 5. North-Hol­land (Am­s­ter­dam), 1985. MR 877325 Zbl 0641.​57008 incollection

P. Baum and A. Connes: “Chern char­ac­ter for dis­crete groups,” pp. 163–​232 in A fête of to­po­logy: Pa­pers ded­ic­ated to Itiro Tamura. Edi­ted by Y. Mat­sumoto, T. Mizutani, and S. Mor­ita. Aca­dem­ic Press (Bo­ston), 1988. MR 928402 Zbl 0656.​55005 incollection