Cabezas, J.M. and Navia, P. 2019. PRESIDENTIAL APPROVAL IN CHILE, 1990-2018: VARIANCE IN U-SHAPED CURVES. Revista Latinoamericana de Opinión Pública. 8, 2 (Nov. 2019), 63–87. DOI:https://doi.org/10.14201/rlop.22354.