@article{Babenko_Parfinovych_2009, title={Nonsymmetric approximations of classes of periodic functions by splines of defect 2 and Jackson-type inequalities}, volume={61}, url={https://umj.imath.kiev.ua/index.php/umj/article/view/3113}, abstractNote={We determine the exact values of the best (α, β)-approximations and the best one-sided approximations of classes of differentiable periodic functions by splines of defect 2. We obtain new sharp Jackson-type inequalities for the best approximations and the best one-sided approximations by splines of defect 2.}, number={11}, journal={Ukrains’kyi Matematychnyi Zhurnal}, author={Babenko, V. F. and Parfinovych, N. V.}, year={2009}, month={Nov.}, pages={1443-1454} }