Forsyth, Andrew Russell <br/><br/>
Theory of differential equations  exact equations and pfaffs problem 

 - New York  Dover publications  1959 
 - 344 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential equaitons
<br/><br/><label>Dewey Class. No.: </label>517.38  / F77T