Geodesic
A Non-free Parafree Group All of Whose Countable Subgroups are Free.
Mathematische Zeitschrift, Tome 148 (1976), pp. 63-66.

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@article{MZ_1976__148_172350,
     author = {Gilbert Baumslag and Urs Stammbach},
     title = {A {Non-free} {Parafree} {Group} {All} of {Whose} {Countable} {Subgroups} are {Free.}},
     journal = {Mathematische Zeitschrift},
     pages = {63--66},
     publisher = {mathdoc},
     volume = {148},
     year = {1976},
     zbl = {0308.20028},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__148_172350/}
}
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%A Urs Stammbach
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Gilbert Baumslag; Urs Stammbach. A Non-free Parafree Group All of Whose Countable Subgroups are Free.. Mathematische Zeitschrift, Tome 148 (1976), pp. 63-66. http://geodesic.mathdoc.fr/item/MZ_1976__148_172350/