Voir la notice de l'article provenant de la source Hellenic Digital Mathematics Library
@article{MR_1981__21_a7, author = {A. D. Tzouvaras}, title = {A {non-Standard} {Characterization} of the norm of free {Ultrafilters}}, journal = {M\ensuremath{\alpha}\ensuremath{\theta}\ensuremath{\eta}\ensuremath{\mu}\ensuremath{\alpha}\ensuremath{\tau}\ensuremath{\iota}\ensuremath{\kappa}\ensuremath{\acute\eta} E\ensuremath{\pi}\ensuremath{\iota}\ensuremath{\theta}\ensuremath{\varepsilon}\ensuremath{\acute\omega}\ensuremath{\rho}\ensuremath{\eta}\ensuremath{\sigma}\ensuremath{\eta} }, pages = {81-85}, publisher = {mathdoc}, volume = {21}, year = {1981}, language = {gr}, url = {http://geodesic.mathdoc.fr/item/MR_1981__21_a7/} }
A. D. Tzouvaras. A non-Standard Characterization of the norm of free Ultrafilters. Μαθηματική Επιθεώρηση , Tome 21 (1981), p. 81-85. http://geodesic.mathdoc.fr/item/MR_1981__21_a7/