Berhanu Shiferaw <br/><br/>
An Introduction to Involutive Structures 
/ by Shiferaw Berhanu 
 - New York  Cambridge University Press  2008 
 - 392p. 
<br/><br/><label>ISBN: </label>9780521878579 
<br/><br/><label>Dewey Class. No.: </label>511.322  / BER/A