@article{10_4153_CJM_1974_049_2,
     author = {Mott, Joe L.},
     title = {Convex {Directed} {Subgroups} of a {Group} of {Divisibility}},
     journal = {Canadian journal of mathematics},
     pages = {532--542},
     year = {1974},
     volume = {26},
     number = {3},
     doi = {10.4153/CJM-1974-049-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-049-2/}
}