Schianchi, Rosanna, y Lucio Boccardo. «A Remark on the L’-Regularity of the Minima of Functionals of the Calculus of Variations». Revista Matemática Complutense 2, no. 1 (enero 1, 1989): 113. https://doi.org/10.5209/rev_REMA.1989.v2.n1.18161.