@article{10_4153_CJM_1977_020_0,
     author = {Conway, John B.},
     title = {On the {Calkin} {Algebra} and the {Covering} {Homotopy} {Property,} {II}},
     journal = {Canadian journal of mathematics},
     pages = {210--215},
     year = {1977},
     volume = {29},
     number = {1},
     doi = {10.4153/CJM-1977-020-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-020-0/}
}