@article{bwmeta1.element.desklight-69b39d17-1ec1-4f2d-864d-7bde07740920,
author = {Rodney Nillsen},
title = {Discrete orbits in $\beta$N-N},
journal = {Colloquium Mathematicae},
volume = {33},
year = {1975},
pages = {71-81},
zbl = {0279.54022},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.desklight-69b39d17-1ec1-4f2d-864d-7bde07740920}
}
Rodney Nillsen. Discrete orbits in βN-N. Colloquium Mathematicae, Tome 33 (1975) pp. 71-81. http://gdmltest.u-ga.fr/item/bwmeta1.element.desklight-69b39d17-1ec1-4f2d-864d-7bde07740920/