TY  - JOUR
AU  - Hartley, Richard
AU  - Murasugi, Kunio
TI  - Covering Linkage Invariants
JO  - Canadian journal of mathematics
PY  - 1977
SP  - 1312
EP  - 1339
VL  - 29
IS  - 6
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-132-2/
DO  - 10.4153/CJM-1977-132-2
ID  - 10_4153_CJM_1977_132_2
ER  -