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References
H. Rádström, One-parameter semigroups of subsets of a real linear space.
S. Kurepa, On the functional equationf(x+y)−f(x)f(y)−g(x)g(y).
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Henney, D.R. Quadratic set-valued functions. Ark. Mat. 4, 377–378 (1962). https://doi.org/10.1007/BF02591511
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DOI: https://doi.org/10.1007/BF02591511