\Bibitem{Nik45} \by P.~Nikolayeff \paper L'anamorphose des \'equations \jour Sb. Math. \yr 1945 \vol 59 \issue 2 \mathnet{http://mi.mathnet.ru//eng/sm6352} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=15932} \zmath{https://zbmath.org/?q=an:0061.28906}