Y. Chapovsky, “Gelfand pair associated with a hoph algebra and a coideal”, Ukr. Mat. Zhurn., vol. 46, no. 8, pp. 1055–1066, Aug. 1994, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5658