@article{10_4153_CJM_1975_057_x,
     author = {Mccandless, Byron H.},
     title = {On {\ensuremath{\Sigma}-Finite} {Families}},
     journal = {Canadian journal of mathematics},
     pages = {481--488},
     year = {1975},
     volume = {27},
     number = {3},
     doi = {10.4153/CJM-1975-057-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1975-057-x/}
}