Pogorelov, A. V. <br/><br/>
Hilbert's fourth problem. 

 - Washington :  New York :  V. H. Winston ;  distributed solely by Halsted Press,  1979. 
 - vi, 97 p. ; 
<br/><br/> Translation of Chetvertai︠a︡ problema Gilʹberta.  Includes index. 
<br/><br/><label>ISBN: </label>0470267356 (Halsted) 
<br/><br/><label>Dewey Class. No.: </label>516/.1  / POG