@article{bwmeta1.element.bwnjournal-article-fmv102i1p27bwm,
author = {Eric van Douwen and Teodor Przymusi\'nski},
title = {First countable and countable spaces all compactifications of which contain $\beta$N},
journal = {Fundamenta Mathematicae},
volume = {103},
year = {1979},
pages = {229-234},
zbl = {0398.54016},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv102i1p27bwm}
}
van Douwen, Eric; Przymusiński, Teodor. First countable and countable spaces all compactifications of which contain βN. Fundamenta Mathematicae, Tome 103 (1979) pp. 229-234. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv102i1p27bwm/