Arcozzi, N., Ferrari, F. and Montefalcone, F. 2017. Regularity of the distance function to smooth hypersurfaces in some two-step Carnot groups. Annales Fennici Mathematici. 42, 1 (Feb. 2017), 339–356. DOI:https://doi.org/10.5186/aasfm.2017.4222.