TY  - BOOK
AU  - Welsh D.J.A
TI  - Complexity: knots, colourings and countings
SN  - 0521457408
AV  - QA 612.14 .W45  
PY  - 1993///
CY  - Cambridges
PB  -  CUP
KW  - Knots-Complexity
ER  -