Celebratio Mathematica

J. S. Birman: “Poin­caré’s con­jec­ture and the homeotopy group of a closed, ori­ent­able 2-man­i­fold,” pp. 214–​221 in Col­lec­tion of art­icles ded­ic­ated to the memory of Hanna Neu­mann, VI, published as J. Aus­tral. Math. Soc. 17 : 2. Aus­trali­an Na­tion­al Uni­versity (Can­berra), March 1974. MR 0343255 Zbl 0282.​55003 incollection