Pantic, I., Malbasa, M., Ristic, S., Turjacanin, D., Medenica, S., Paunovic, J. y Pantic, S. 2011. Screen viewing, BMI, cigarette smoking and sleep duration in Belgrade university student population: Results of an observational, cross-sectional study. Revista Médica de Chile. 139, 7 (jul. 2011).