@Article{ crafragaz01, author = { Crasta, Graziano and FragalĂ , Ilaria and Gazzola, Filippo }, title = { A sharp upper bound for the torsional rigidity of rods by means of web functions }, journal = { Arch. Rational Mech. Anal. }, year = { 2002 }, volume = { 164 }, number = { 3 }, pages = { 453-469 }, URL = { http://cvgmt.sns.it/paper/150/ }, note = { cvgmt preprint} }