Kagan, V. F.  1869-1953 <br/><br/>
N. Lobachevsky and his contribution to science / 
V. F. Kagan ; translated [from the Russian] by B. Katah 
 - Moscow :  Foreign Languages Pub. House,  1957 
 - 92 p. :  ill. ;  20 cm. 
 - Men of Russian science .
<br/><br/>Bibliography : p. 88-92 
<br/><br/><label>Subjects--Personal Names: </label><br/>Lobachevsky N., 1792-1856 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry, Hyperbolic
<br/><br/><label>Dewey Class. No.: </label>92