Ojha, B. P., and P. M. Bajrayacharya. “Relation of Pythagorean and Isosceles Orthogonality With Best Approximations in Normed Linear Space”. Mathematics Education Forum Chitwan, vol. 4, no. 4, Nov. 2019, pp. 72-78, doi:10.3126/mefc.v4i4.26360.