Welsh D.J.A <br/><br/>
Complexity   knots, colourings and countings. 
D.J Welsh 
 - Cambridges   CUP  1993 
<br/><br/><label>ISBN: </label>0521457408 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Knots-Complexity
<br/><br/><label>LC Class. No.: </label>QA 612.14 .W45