Burstall, F. E., etal. <br/><br/>
Conformal geometry of surfaces in S4 and quaternions   
by F E Burstall, etal 
 - New York  Springer  2002 
 - 86p. 
 - Lecture Notes in Mathematics  1772 .
<br/><br/><label>ISBN: </label>3540430083 
<br/><br/><label>Dewey Class. No.: </label>516.36  / P021