@article{GDZPPN002417332,
title = {A Non-free Parafree Group All of Whose Countable Subgroups are Free.},
journal = {Mathematische Zeitschrift},
volume = {147},
year = {1976},
pages = {63-66},
zbl = {0308.20028},
url = {http://dml.mathdoc.fr/item/GDZPPN002417332}
}
Baumslag, Gilbert; Stammbach, Urs. A Non-free Parafree Group All of Whose Countable Subgroups are Free.. Mathematische Zeitschrift, Tome 147 (1976) pp. 63-66. http://gdmltest.u-ga.fr/item/GDZPPN002417332/