Celebratio Mathematica

W. Abikoff, K. Ap­pel, and P. Schupp: “Lift­ing sur­face groups to \( \mathrm{SL}(2,\mathbb{C}) \),” pp. 1–​5 in Klein­i­an groups and re­lated top­ics (Oaxte­pec, Mex­ico, 10–14 Au­gust 1981). Edi­ted by D. M. Gallo and R. M. Port­er. Lec­ture Notes in Math­em­at­ics 971. Spring­er (Ber­lin), 1983. MR 690272 Zbl 0531.​30037 incollection