Forsyth, Andrew Russell. <br/><br/>
Theory of Differential Equations Part 1 :Exact Equations and PFaff`s Problem /  

 - 1st ed /  
 - New York :   Dover Publications, Inc ,   1994 
 - xiii, 344p ;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics <Differential Equations>
<br/><br/><label>Dewey Class. No.: </label>B333  / J9F.1-2