%0 Journal Article %A Lamel, Bernhard %A Son, Duong Ngoc %T The CR Ahlfors derivative and a new invariant for spherically equivalent CR maps %J Annales de l'Institut Fourier %D 2021 %P 2137-2167 %V 71 %N 5 %I Association des Annales de l’institut Fourier %U https://aif.centre-mersenne.org/articles/10.5802/aif.3438/ %R 10.5802/aif.3438 %G en %F AIF_2021__71_5_2137_0