G. F. Us and E. W. Lytvynov, “Dual Appell systems in non-Gaussian white noise calculus”, MFAT, vol. 2, no. 2, pp. 70–85, Aug. 1996, Accessed: Feb. 04, 2026. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/14