Generalized quadrangles, symmetrization, and nonunivalent mappings. (English. Russian original) Zbl 0665.30026
J. Sov. Math. 43, No. 4, 2614-2621 (1988); translation from Zap. Nauchn. Semin. Leningr. Otd. Mat. Inst. Steklova 154, 163-174 (1986).
MSC:
30C99