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HIDEO TAKEMOTO, ATSUSHI UCHIYAMA, LASZLO ZSIDO "The $\sigma$-Convexity Of All Bounded Convex Sets In $\mathbb{R}^{\mathfrak{n}}$ And $\mathbb{C}^{n}$," Nihonkai Mathematical Journal, Nihonkai Math. J. 14(1), 61-64, (2003)