@article{bwmeta1.element.bwnjournal-article-smv34i1p2bwm,
author = {R. Kaufman},
title = {Perfect sets in some groups},
journal = {Studia Mathematica},
volume = {34},
year = {1970},
pages = {17-21},
zbl = {0188.45401},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv34i1p2bwm}
}
Kaufman, R. Perfect sets in some groups. Studia Mathematica, Tome 34 (1970) pp. 17-21. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv34i1p2bwm/