Kalyuzhnyi, A. A., Podkolzin, G. B., & Chapovsky, Y. (2005). Conditional Expectations on Compact Quantum Groups and Quantum Double Cosets. Ukrains’kyi Matematychnyi Zhurnal, 57(5), 644–653. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3630