Hansen, Vagn Lundsgaard. <br/><br/>
Braids and Coverings :  selected topics / 
Vagn Lundsgaard Hansen. 
 - Cambridge :  Cambridge University Press,  1989. 
 - x, 191 p. :  ill. ;  23 cm. 
 - London Mathematical Society student texts ;  18. .
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0521384796 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Braid theory.<br/>Covering spaces--Topology