00521nam a2200181Ia 4500 0387404635 516 Ak315.DG Akivis, Maks A. and Goldberg, Vladislav V. Differential geometry of varieties with degenerate gauss maps New York Springer-Verlag 2004 xxi, 255p. Bibl. Index. CMS books in Mathematics v.18 Goldberg, Vladislav V;jt. auth 0 0 0 0 ISI ISI 2004-02-10 SBD 512265.25 0 516 Ak315.DG DP26327 2019-02-14 00:00:00 2019-02-14 BK Ord num:6524; Ord dt:2004-02-05 24883 24883 24883