Symposium on Geometry of Low-dimensional Manifolds, LMS, Durham, July 1989. <br/><br/>
Geometry of low-dimensional manifolds  ; proceedings of the Durham symposium / 

 - Cambridge:  Cambridge University Press,  1990 
 - 
 - London Mathematical Society lecture note series  v.150 .
<br/><br/><label>Dewey Class. No.: </label>516  / Sy989.GL