@Article{ BruQuoSte18, author = { Bruè, Elia and Nguyen, Quoc-Hung and Stefani, Giorgio }, title = { A maximal function characterization of absolutely continuous measures and Sobolev functions }, journal = { Atti Accad. Naz. Lincei Rend. Lincei Mat. Appl. }, year = { 2019 }, doi = { 10.4171/RLM/862 }, volume = { 30 }, number = { 3 }, pages = { 599--614 }, URL = { http://cvgmt.sns.it/paper/3969/ }, note = { cvgmt preprint} }