Subdifferential Calculus and Nonsmooth Critical Point Theory. - Ines Campa; Marco Degiovanni (SIAM J. Optim., 2000)

On the Euler–Lagrange Equation for Functionals of the Calculus of Variations without Upper Growth Conditions. - Marco Degiovanni; Marco Marzocchi (SIAM J. Control. Optim., 2009)

Multiple Critical Points for Symmetric Functionals without upper Growth Condition on the Principal Part. - Marco Degiovanni; Marco Marzocchi (Symmetry, 2021)