Isotope data on barite and celestite deposits related to three mesozoic evaporitic sequences of the Neuquén Basin, Argentina - Brodtkorb, Milka K. O.; Barbieri, Mario; Hladiková, K. Z.; Tassinari, Colombo Celso Gaeta; Ametrano, S.; Etcheverry, R.; De Barrio, Raúl Ernesto; Danieli, J. C. (International Geology Review, 1997)