Balderas, F., Fernandez, E., Gómez Santillán, C., Rivera, G., Cruz-Reyes, L., & Rangel, N. (2016). Uncertainty Modelling for Project Portfolio Problem using Interval Analysis. International Journal of Combinatorial Optimization Problems and Informatics, 7(3), 20–27. Retrieved from https://www.ijcopi.org/ojs/article/view/24