Landau L. D.; Lifshitz E. M. <br/><br/>
The classical theory of fields 

<br/><br/><label>ISBN: </label>SL01446415 
<br/><br/><label>Standard No.: </label>196339 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Dewey Class. No.: </label>CM65, L5.2;18