Thirring, Walter. <br/><br/>
Course in Mathematical Physics: Classical Field Theory /  
translated by Evans M. Harrell. 
 - 1st ed /  
 - New York :   Springer-Verlag. 
 - p.249 :  
<br/><br/><label>ISBN: </label>0-387-81532-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B7:3  / L9