Forsyth, Andrew Russell, <br/><br/>
A treatise on differential equations / 
A.R. Forsyth. 
 - 6th ed. 
 - London :  Macmillan  1961 
 - xviii, 583 p. ;  21 cm. 
<br/><br/> Previously published: 6th ed. London : Macmillan ; New York : St. Martin's Press, 1929.  Includes index. 
<br/><br/><label>Subjects--Index Terms: </label>Differential equations 
<br/><br/><label>Dewey Class. No.: </label>515/.35  / FOR