Betz, Herman <br/><br/>
Differential equations with applications 

 - 2nd ed. 
 -  Harper & Row  1964 
 - xi, 354p.   
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<br/><br/><label>Subjects--Index Terms: </label>Differential equations  Functional equations 
<br/><br/><label>Dewey Class. No.: </label>517.91