TY  - BOOK
AU  - Hansen, Vagn Lundsga
TI  - BRAIDS AND COVERINGS
SN  - 052138774
U1  - 514.224 
PY  - 1989///
CY  - Cambridge
PB  - Cambridge Univ. Pr.
KW  - Braid Theory
KW  - Combinatorial Topology
ER  -