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Additional information
Gorki. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 1, pp. 89–95, January–February, 1989.
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Gordon, E.I. Relatively standard elements in Nelson's internal set theory. Sib Math J 30, 68–73 (1989). https://doi.org/10.1007/BF01054217
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DOI: https://doi.org/10.1007/BF01054217