Celebratio Mathematica

R. Bott and H. Samel­son: “Ap­plic­a­tions of the the­ory of Morse to sym­met­ric spaces,” Am. J. Math. 80 : 4 (October 1961), pp. 964–​1029. Ded­ic­ated to Mar­ston Morse on his 65th birth­day. A cor­rec­tion was pub­lished in Am. J. Math. 83:1 (1961). MR 0105694 Zbl 0101.​39702 article

R. Bott: “The in­dex the­or­em for ho­mo­gen­eous dif­fer­en­tial op­er­at­ors,” pp. 167–​186 in Dif­fer­en­tial and com­bin­at­or­i­al to­po­logy: A sym­posi­um in hon­or of Mar­ston Morse (Prin­ceton, NJ, 1964). Edi­ted by S. S. Cairns. Prin­ceton Math­em­at­ic­al Series 27. Prin­ceton Uni­versity Press, 1965. MR 0182022 Zbl 0173.​26001 incollection