@article{AIF_2021__71_5_2137_0,
     author = {Lamel, Bernhard and Son, Duong Ngoc},
     title = {The {CR} {Ahlfors} derivative and a new invariant for spherically equivalent {CR} maps},
     journal = {Annales de l'Institut Fourier},
     pages = {2137--2167},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {71},
     number = {5},
     year = {2021},
     doi = {10.5802/aif.3438},
     language = {en},
     url = {https://aif.centre-mersenne.org/articles/10.5802/aif.3438/}
}