A characterization of internal sets
Rendiconti del Seminario Matematico della Università di Padova, Volume 81 (1989), pp. 193-200.
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     author = {Tortorelli, V. M.},
     title = {A characterization of internal sets},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {193--200},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {81},
     year = {1989},
     zbl = {0686.03039},
     mrnumber = {1020193},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1989__81__193_0/}
}
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Tortorelli, V. M. A characterization of internal sets. Rendiconti del Seminario Matematico della Università di Padova, Volume 81 (1989), pp. 193-200. http://www.numdam.org/item/RSMUP_1989__81__193_0/

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