TY  - BOOK
AU  - D. J. A. Welsh
TI  - Complexity : knots, colourings and counting
SN  - 9780521457408
U1  - 514.2242 WEL(COM) 
PY  - 1993///
PB  - Cambridge University Press, 
KW  - Computational complexity
KW  - Knot theory
KW  - Combinatorial analysis
N1  - SAR/09/2009/20-04-09
ER  -