S. M. S. Nabavi Sales, “On mappings which approximately preserve angles”, Aequat. Math., 92, № 6, 2018, 1079
Mohammad Sal Moslehian, Ali Zamani, “Characterizations of Operator Birkhoff–James Orthogonality”, Can. math. bull., 60, № 4, 2017, 816
Mahdi Dehghani, Ali Zamani, “Characterization of real inner product spaces by Hermite–Hadamard type orthogonalities”, Journal of Mathematical Analysis and Applications, 479, № 1, 2019, 1364
Ali Zamani, “The operator-valued parallelism”, Linear Algebra and its Applications, 505, 2016, 282
MOHAMMAD SAL MOSLEHIAN, ALI ZAMANI, PAWEŁ WÓJCIK, “APPROXIMATELY ANGLE PRESERVING MAPPINGS”, Bull. Aust. Math. Soc., 99, № 03, 2019, 485
Paweł Wójcik, Ali Zamani, “Orthogonality Hilbert 𝒜-modules and operators preserving multi-𝒜-linearity”, Linear and Multilinear Algebra, 70, № 21, 2022, 6176
Ali Zamani, Mohammad Sal Moslehian, “An extension of orthogonality relations based on norm derivatives”, The Quarterly Journal of Mathematics, 70, № 2, 2019, 379
Ali Zamani, Mahdi Dehghani, Ulam Type Stability, 2019, 469
Ateyeh Saraei, Maryam Amyari, “Approximately orthogonality preserving maps in Krein spaces”, Aequat. Math., 94, № 1, 2020, 137
Ali Khalili, Maryam Amyari, “$\mathcal{A}$-valued norm parallelism in Hilbert $\mathcal{A}$-modules”, AIMS Mathematics, 4, № 3, 2019, 527