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Research partially supported by DGICYT p.h. PB91-0334-C03.
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Alsina, C., Guijarro, P. & Tomás, M.S. Generalizations of characterizations of inner product structures under differentiability conditions. Arch. Math 66, 228–232 (1996). https://doi.org/10.1007/BF01195709
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DOI: https://doi.org/10.1007/BF01195709