@Article{ celfermar03, author = { Cellina, Arrigo and Ferriero, Alessandro and Marchini, Elsa }, title = { Reparameterizations and approximation of integrals of the calculus of variations }, journal = { J. Differential Equations }, year = { 2003 }, volume = { 193 }, number = { 2 }, pages = { 374-384 }, URL = { http://cvgmt.sns.it/paper/635/ }, note = { cvgmt preprint} }