Sommerfeld, Arnold <br/><br/>
Practical Differential Equations in Physics 
Lectures on the oretical Physics Volume VI 
 - New York  Academic Press  1964 
 - 335 
<br/><br/><label>Publisher. No.: </label> Sridhar Book Shop 
<br/><br/><label>Subjects--Personal Names: </label> Physics 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physics