\Bibitem{Vai82} \by G.~M.~Vainikko \paper The discrepancy principle for a class of regularization methods \jour Zh. Vychisl. Mat. Mat. Fiz. \yr 1982 \vol 22 \issue 3 \pages 499--515 \mathnet{http://mi.mathnet.ru/zvmmf5746} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=664170} \zmath{https://zbmath.org/?q=an:0528.65033} \transl \jour U.S.S.R. Comput. Math. Math. Phys. \yr 1982 \vol 22 \issue 3 \pages 1--19 \crossref{https://doi.org/10.1016/0041-5553(82)90120-3}