A. A. Kalyuzhnyi, G. B. Podkolzin, and Y. A. Chapovsky, “On Fourier algebra of a hypergroup constructed from a conditional expectation on a locally compact group”, MFAT, vol. 23, no. 1, pp. 37–50, Mar. 2017, Accessed: Dec. 18, 2025. [Online]. Available: https://zen.imath.kiev.ua/index.php/mfat/article/view/652