@article{bwmeta1.element.bwnjournal-article-fmv44i2p115bwm,
author = {H. Griffiths},
title = {Borel sets and countable series of operations},
journal = {Fundamenta Mathematicae},
volume = {44},
year = {1957},
pages = {115-155},
zbl = {0079.00803},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv44i2p115bwm}
}
Griffiths, H. Borel sets and countable series of operations. Fundamenta Mathematicae, Tome 44 (1957) pp. 115-155. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv44i2p115bwm/