@article{10_4153_CJM_1978_057_6,
     author = {Hartley, Richard and Murasugi, Kunio},
     title = {Homology {Invariants}},
     journal = {Canadian journal of mathematics},
     pages = {655--670},
     year = {1978},
     volume = {30},
     number = {3},
     doi = {10.4153/CJM-1978-057-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-057-6/}
}