R. Schianchi y L. Boccardo, «A Remark on the L’-Regularity of the Minima of Functionals of the Calculus of Variations», Rev. mat. complut., vol. 2, n.º 1, p. 113, ene. 1989, doi: https://doi.org/10.5209/rev_REMA.1989.v2.n1.18161