Mazaheri, H., M. S. Abad, and M. A. Dehghan. “2-Farthest Orthogonality in Generalized 2-Normed Spaces”. Journal of the Indonesian Mathematical Society, vol. 24, no. 1, Jan. 2018, pp. 71-78, doi:10.22342/jims.24.1.480.71-78.