Shirokov P A <br/><br/>
Sketch of the fundamentals of lobachevskian geometry 
Shirokov P A 
 -  1964 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>23801 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>B6xL92:9, K4