Silva Figueroa R, Echeverría Herrera G, Vega Arriaza J, Salamanca Vera D. New approach to contract modifications at the sub-directorate of works of the road works directorate . RIOC [Internet]. 2025 Apr. 30 [cited 2026 Jul. 30];13(1):1-16. Available from: https://rioc.ufro.cl/index.php/rioc/article/view/3381