Kazanskii vestnik, Part XXV (Feb. & Mar. 1829 pp. 178-187), Part XXV (April 1829 pp. 228-241), Part XXVII (Nov. & Dec. 1829 pp. 227-243); Part XXVIII (Mar. & Apr. 1830 pp. 251-283); Part XXVIII (July & Aug. 1830 pp. 571-636). Kazan: University Press, 1829-30." /> LOBACHEVSKII, Nicolai Ivanovitch (1793-1856). "O nachalakh geometrii" [in Russian: "On the Principles of Geometry"], in: <I>Kazanskii vestnik,</I> Part XXV (Feb. & Mar. 1829 pp. 178-187), Part XXV (April 1829 pp. 228-241), Part XXVII (Nov. & Dec. 1829 pp. 227-243); Part XXVIII (Mar. & Apr. 1830 pp. 251-283); Part XXVIII (July & Aug. 1830 pp. 571-636). Kazan: University Press, 1829-30. | Christie's