@Misc{ fusgormag03, author = { Fusco, Nicola and Gori, Michele and Maggi, Francesco }, title = { A remark on Serrin's Theorem }, journal = { Nonlinear Differential Equations and Applications }, year = { 2003 }, pages = { }, URL = { http://cvgmt.sns.it/paper/793/ }, note = { cvgmt preprint} }