@article{10_1017_S2040618500033384,
     author = {Neumann, B. H.},
     title = {On a {Conjecture} of {Hanna} {Neumann}},
     journal = {Glasgow mathematical journal},
     pages = {13--17},
     year = {1956},
     volume = {2},
     number = {1},
     doi = {10.1017/S2040618500033384},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500033384/}
}