@Article{ FanPal17, author = { Fanzon, Silvio and Palombaro, Mariapia }, title = { Optimal lower exponent for the higher gradient integrability of solutions to two-phase elliptic equations in two dimensions }, journal = { Calculus of Variations and Partial Differential Equations }, year = { 2017 }, doi = { 10.1007/s00526-017-1222-9 }, volume = { 56 }, number = { 5 }, pages = { 137 }, URL = { http://cvgmt.sns.it/paper/4249/ }, note = { cvgmt preprint} }