Lobachevski{breve}i. N. I. (Nikola{breve}i Ivanovich). 1792 1856. books & textbook
Geometrical researches on the theory of parallels. by Nicholas L
Lobachevski{breve}i. N. I. (Nikola{breve}i Ivanovich). 1792-1856.
Chicago [etc.] Open Court Publishing Company, 1914. /1914-01-01 Paperback
