@article {1995, title = {An existence result in a problem of the vectorial case of the calculus of variations}, year = {1995}, publisher = {SIAM}, abstract = {SIAM J. Control Optim. 33 (1995) 960-970}, url = {http://hdl.handle.net/1963/3513}, author = {Arrigo Cellina and Sandro Zagatti} }