Optimal recovery of analytic functions by their values in a uniform grid on a circle. Osipenko, K.Yu. — 2003 Vladikavkazskiĭ Matematicheskiĭ Zhurnal
Optimal reconstruction of derivatives on the Sobolev classes. Magaril-Il'yaev, G.G.; Osipenko, K.Yu. — 2003 Vladikavkazskiĭ Matematicheskiĭ Zhurnal