[1]
E. Casas y A. Fernández, «Optimal Control of Quasilinear Elliptic Equations with non Dilferentiable Coefficients at the Origin», Rev. mat. complut., vol. 4, n.º 2, p. 227, ene. 1991, doi: https://doi.org/10.5209/rev_REMA.1991.v4.n2.17974