O. D. . Aguirre Ospina, Ángela M. . Ríos Medina, M. . Calderón Marulanda, and L. M. . Gómez Buitrago, “Cumulative Sum learning curves (CUSUM) in basic anaesthesia procedures”, Colomb. J. Anesthesiol., vol. 42, no. 3, pp. 142–153, Jul. 2014.