@misc{10_4153_CJM_1971_006_3,
     title = {On {Expanding} {Locally} {Finite} {Collections}},
     journal = {Canadian journal of mathematics},
     pages = {58--68},
     year = {1971},
     volume = {23},
     number = {1},
     doi = {10.4153/CJM-1971-006-3},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-006-3/}
}