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This paper was prepared while the author worked as a Humboldt research fellow at the University of Saarbrücken, Germany.
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Páles, Z. Linear selections for set-valued functions and extension of bilinear forms. Arch. Math 62, 427–432 (1994). https://doi.org/10.1007/BF01196433
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DOI: https://doi.org/10.1007/BF01196433