Geometrical researches on the theory of parallels
Lobachevskiĭ, N. I.
Geometrical researches on the theory of parallels by Nicholas Lobachevski ... tr. from the original by George Bruce Halsted ... - New ed. - Chicago [etc.] Open Court Publishing Company 1914. - 50 p. front. (port.) diagrs. 25 cm.
Bibliography: p. 49-50.
14013988
Geometry, Non-Euclidean
QA685 / .L78 1914
Geometrical researches on the theory of parallels by Nicholas Lobachevski ... tr. from the original by George Bruce Halsted ... - New ed. - Chicago [etc.] Open Court Publishing Company 1914. - 50 p. front. (port.) diagrs. 25 cm.
Bibliography: p. 49-50.
14013988
Geometry, Non-Euclidean
QA685 / .L78 1914