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This paper was written while the author was visiting the Department of Mathematics of the Colorado University at Boulder (USA) in April, 1992.
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Alonso, J. Some results on Singer orthogonality and characterizations of inner product spaces. Arch. Math 61, 177–182 (1993). https://doi.org/10.1007/BF01207467
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DOI: https://doi.org/10.1007/BF01207467