@Article{ BarFelSor20, author = { Bardi, Martino and Feleqi, Ermal and Soravia, Pierpaolo }, title = { Regularity of the minimum time and of viscosity solutions of degenerate eikonal equations via generalized Lie brackets }, journal = { Set-Valued and Variational Analysis }, year = { 2021 }, doi = { 10.1007/s11228-020-00539-z }, volume = { 29 }, number = { 1 }, pages = { 83--108 }, URL = { http://cvgmt.sns.it/paper/4707/ }, note = { cvgmt preprint} }