Kosyak, A. V. “The Generalized Ismagilov Conjecture for the Group $B_0^N.$ I”. Methods of Functional Analysis and Topology 8, no. 2 (June 25, 2002): 33–49. Accessed February 4, 2026. https://zen.imath.kiev.ua/index.php/mfat/article/view/182.