Elen, L.W.F. <br/><br/>
Differential equations -1 /  

 - 1st edn /  
 - London :   Macmillan & co ltd ,   1969 
 - 220p ;  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B333  / K5.1