Dacorogna, BernardMarcellini, PaoloTanteri, Chiara2008-11-252008-11-252008-11-25200010.1016/S0764-4442(00)00147-6https://infoscience.epfl.ch/handle/20.500.14299/31701quasiconvex constraintspositivity of the determinantmethod of confocal ellipses of Murat-TartarImplicit type equations with constraints. (Équations de type implicite avec contraintes.)text::journal::journal article::research article