Hopf, Ludwig,  1884- <br/><br/>
Introduction to the differential equations of physics/ 
trad. by Walter Nef. 
 - New York:  Dover,  1948. 
 - v, 154 p.:  17 cm. 
 - Dover series in mathematics and physics .
<br/><br/><label>LCCN: </label>48003072 //r85 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equations.
<br/><br/><label>Dewey Class. No.: </label>515.35  / H792i