Velásquez Gallo, María Ana, and Jorge Martínez Collantes. “Time Series Missing Data Imputation Using Restricted Multivariate Methods”. Comunicaciones en Estadística 2, no. 2 (August 28, 2009): 123–128. Accessed October 25, 2026. https://revistas.usantotomas.edu.co/index.php/estadistica/article/view/34.