Postnikov, M. M. <br/><br/>
The variational theory of geodesics 

 - New York:   Dover Publications,   1983. 
 - viii, 200 p.  graf.;  
<br/><br/><label>ISBN: </label>0486631664 
<br/><br/><label>Subjects--Topical Terms: </label><br/>GEOMETRIA DIFERENCIAL<br/>GEOMETR� A<br/>GEODESICS