Celebratio Mathematica

R. S. Pal­ais and S. Smale: “A gen­er­al­ized Morse the­ory,” Bull. Am. Math. Soc. 70 : 1 (1964), pp. 165–​172. MR 158411 Zbl 0119.​09201 article

R. S. Pal­ais: “Crit­ic­al point the­ory and the min­im­ax prin­ciple,” pp. 185–​212 in Glob­al ana­lys­is (Berke­ley, CA, 1–26 Ju­ly 1968). Edi­ted by S.-S. Chern and S. Smale. Pro­ceed­ings of Sym­po­sia in Pure Math­em­at­ics 15. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1970. MR 264712 Zbl 0212.​28902 incollection