Novikov, S.I. (1999) “Approximation of one class of differentiable functions by piecewise-HermitianL-splines”, Ukrains’kyi Matematychnyi Zhurnal, 51(11), pp. 1495–1504. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4751 (Accessed: 10 April 2025).