Kells, Lyman M.  (1888- ). <br/><br/>
Elementary differential equations / 
by Lyman M. Kells. 
 - 3rd ed. 
 - New York ;  London :  McGraw-Hill Book Company,  1947. 
 - XIV, 312s. :  il. ;  21 cm. 
<br/><br/>Indeks. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Równania różniczkowe.