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@article{10_4064_cm_33_1_71_81, author = {Rodney Nillsen}, title = {Discrete orbits in {\ensuremath{\beta}N-N}}, journal = {Colloquium Mathematicum}, pages = {71--81}, publisher = {mathdoc}, volume = {33}, number = {1}, year = {1975}, doi = {10.4064/cm-33-1-71-81}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-33-1-71-81/} }
Rodney Nillsen. Discrete orbits in βN-N. Colloquium Mathematicum, Tome 33 (1975) no. 1, pp. 71-81. doi : 10.4064/cm-33-1-71-81. http://geodesic.mathdoc.fr/articles/10.4064/cm-33-1-71-81/
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