Blatt HP, Grothmann R, Kovacheva RK. Sign changes in rational Lw1-approximation. Ukr. Mat. Zhurn. [Internet]. 2006 Feb. 25 [cited 2025 Dec. 6];58(2):283–287. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/3452