A. Dehghan Nezhad, N. Mirkov, V. . Todorčević, and S. . Radenović, “A different approach to b(αn,βn)-hypermetric spaces”, Vojnoteh. glas., vol. 70, no. 1, pp. 24–42, Jan. 2022, doi: 10.5937/vojtehg70-35303.