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Eskandari, R., Moslehian, M. S., & Popovici, D. (2021). Operator equalities and Characterizations of Orthogonality in Pre-Hilbert C*-Modules. Proceedings of the Edinburgh Mathematical Society, 1–21. doi:10.1017/s0013091521000341 
10.1017/s0013091521000341
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