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2015. Bishop-Phelps-Bollobas modulus of a uniformly non-square Banach space. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 81, (Dec. 2015), 4–9. DOI:https://doi.org/10.26565/2221-5646-2015-81-01.