Walker, Kevin. <br/><br/>
Extension of casson's invariant   
by Kevin Walker 
 - New Jersey  Princeton University Press  1992 
 - v, 131p. 
 - Annals of mathematics studies  No.126 .
<br/><br/><label>ISBN: </label>0691025320 
<br/><br/><label>Dewey Class. No.: </label>514.3  / N921