Shirokov, P.A. <br/><br/>
Sketch of the fundamentals of lobachevskian geometry 

 - Netherlands  P.Noordhoff  1963 
 - 87p. 
<br/><br/><label>Subjects--Uniform Titles: </label><br/>Geometry
<br/><br/><label>Dewey Class. No.: </label>516.36  / S40S