@article{MZ_1977__153_172485,
     author = {Gilbert Baumslag and Frank B. Cannonito},
     title = {Infinitely {Generated} {Subgroups} of {Finitely} {Presented} {Groups.I.}},
     journal = {Mathematische Zeitschrift},
     pages = {117--134},
     publisher = {mathdoc},
     volume = {153},
     year = {1977},
     zbl = {0332.20009},
     url = {http://geodesic.mathdoc.fr/item/MZ_1977__153_172485/}
}