Celebratio Mathematica

Y. Eli­ash­berg and M. Gro­mov: “Lag­rangi­an in­ter­sec­tion the­ory: Fi­nite-di­men­sion­al ap­proach,” pp. 27–​118 in Geo­metry of dif­fer­en­tial equa­tions. Edi­ted by A. Khovanskiĭ, A. Varchen­ko, and V. Vassiliev. Amer. Math. Soc. Transl. Ser. 2 186. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 1998. MR 1732407 Zbl 0919.​58015 incollection