\Bibitem{Loi24} \by L\'eon~Lo{\"\i}ziansky \paper Sur l'inversion approch\'ee des fonctions. \jour Sb. Math. \yr 1924 \vol 31 \issue 3 \mathnet{http://mi.mathnet.ru/eng/sm6918} \zmath{https://zbmath.org/?q=an:50.0283.03}