Berhanu, Shiferaw <br/><br/>
An introduction to involutive structures / 
Shiferaw Berhanu, Paulo D. Cordaro, Jorge Hounie 
 - Cambridge ;  New York :  Cambridge University Press,  c2008 
 - xii, 392 p. ;  24 cm. 
 - New mathematical monographs ;  6 .
<br/><br/>Includes bibliographical references (p. 381-389) and index 
<br/><br/><label>ISBN: </label>9780521878579 0521878578 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Vector fields<br/>Differential equations, Partial<br/>Bivectors<br/>Approximation theory