Celebratio Mathematica

J. Hass: “What is an al­most nor­mal sur­face?,” pp. 1–​13 in Geo­metry and to­po­logy down un­der: A con­fer­ence in hon­our of Hyam Ru­bin­stein (Mel­bourne, 11–22 Ju­ly 2011). Edi­ted by C. D. Hodg­son, W. H. Jaco, M. G. Schar­le­mann, and S. Till­mann. Con­tem­por­ary Math­em­at­ics 597. Amer­ic­an Math­em­at­ic­al So­ci­ety (Provid­ence, RI), 2013. MR 3186667 Zbl 1279.​57002 incollection