M. A. Demba, H. Ramos, W. Watthayu, N. Senu, and F. A. Fawzi, “A TRIGONOMETRICALLY ADAPTED EMBEDDED PAIR OF EXPLICIT RUNGE-KUTTA-NYSTR¨OM METHODS TO SOLVE PERIODIC SYSTEMS”, Bangmod J-MCS., vol. 7, pp. 14–34, Dec. 2021.