Casas E, Fernández A. Optimal Control of Quasilinear Elliptic Equations with non Dilferentiable Coefficients at the Origin. Rev. mat. complut. [Internet]. 1 de enero de 1991 [citado 16 de febrero de 2025];4(2):227. Disponible en: https://doi.org/10.5209/rev_REMA.1991.v4.n2.17974