The Higher Integrability and the Validity of the Euler-Lagrange Equation for Solutions to Variational Problems. - Giovanni Bonfanti; Arrigo Cellina; Marco Mazzola (SIAM J. Control. Optim., 2012)

The Nonoccurrence of the Lavrentiev Phenomenon for a Class of Variational Functionals. - Giovanni Bonfanti; Arrigo Cellina (SIAM J. Control. Optim., 2013)