RukasovV. I. (2003) “Best <em class="a-plus-plus">n</em&gt;-Term Approximations in Spaces with Nonsymmetric Metric”, Ukrains’kyi Matematychnyi Zhurnal, 55(4), pp. 500-509. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3923 (Accessed: 6October2024).