BOLTYANSKY, V.G. <br/><br/>
Differentiation explained / 
[by] V.G.Boltlyansky 
 - [s.n.]  S.l.]  0 
 - 62 p. 
<br/><br/><label>ISBN: </label>61917 
<br/><br/><label>Dewey Class. No.: </label>515.33  / BOL