Celebratio Mathematica

M. Atiyah and J. Berndt: “Pro­ject­ive planes, Severi vari­et­ies and spheres,” pp. 1–​27 in Sur­veys in dif­fer­en­tial geo­metry: Lec­tures on geo­metry and to­po­logy held in hon­or of Calabi, Lawson, Siu, and Uh­len­beck (Har­vard Uni­versity, 3–5 May 2002). Edi­ted by S.-T. Yau. Sur­veys in Dif­fer­en­tial Geo­metry (Journ­al of Dif­fer­en­tial Geo­metry sup­ple­ments) 8. In­ter­na­tion­al Press (Somerville, MA), 2003. MR 2039984 Zbl 1057.​53040 ArXiv math/​0206135 incollection