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The nonabsolute boundedness model of the theory of semisets Karel Čuda (1977) Commentationes Mathematicae Universitatis Carolinae
Theory of hypernumbers and extrafunctions: functional spaces and differentiation. Burgin, Mark (2002) Discrete Dynamics in Nature and Society
Transformadas De Poisson De Funciones No-Estandares. Yu Takeuchi (1984) Revista colombiana de matematicas
Translation of nonstandard definitions to standard ones Karel Čuda (1984) Commentationes Mathematicae Universitatis Carolinae