Денисюк, В. П., and Л. В. Рибачук. “About Fractional Integro-Differentiating the Trigonometric Functions”. Problems of Informatization and Control 2, no. 24 (December 20, 2008): 46–50. Accessed June 14, 2026. http://jrnl.kai.edu.ua/index.php/PIU/article/view/6763.