@Article{ LamVio18, author = { Lamberti, Pier Domenico and Violo, Ivan Yuri }, title = { On Stein's extension operator preserving Sobolev-Morrey spaces }, journal = { Math. Nachr. }, year = { 2018 }, volume = { 292 }, number = { 8 }, pages = { 1701-1715 }, URL = { http://cvgmt.sns.it/paper/4992/ }, note = { cvgmt preprint} }