@article{MZ_1971__119_171482,
     author = {Robert G. Burns},
     title = {On the {Intersection} of {Finitely} {Generated} {Subgroups} of a {Free} {Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {121--130},
     publisher = {mathdoc},
     volume = {119},
     year = {1971},
     zbl = {0197.29801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__119_171482/}
}