Celebratio Mathematica

M. F. Atiyah: “Hy­per­bol­ic dif­fer­en­tial equa­tions and al­geb­ra­ic geo­metry (after Pet­rowsky),” pp. 87–​99 in Sémin­aire Bourbaki 1966/1967. W. A. Ben­jamin (New York and Am­s­ter­dam), 1968. Ex­posé no. 319. Re­pub­lished in 1995. Zbl 0201.​12501 incollection

M. F. Atiyah: “Hy­per­bol­ic dif­fer­en­tial equa­tions and al­geb­ra­ic geo­metry (after Pet­rowsky),” pp. 87–​99 in Sémin­aire Bourbaki 10: An­nées 1966/67–1967/68. So­ciété Math­ématique de France (Par­is), 1995. Ex­posé no. 319. Re­pub­lic­a­tion of 1968 ori­gin­al. MR 1610456 incollection