@article{10_4153_CJM_1966_041_0,
     author = {Rider, Daniel},
     title = {Gap {Series} on {Groups} and {Spheres}},
     journal = {Canadian journal of mathematics},
     pages = {389--398},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-041-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-041-0/}
}