1. S. S. Akbarov, Private communication, 2016.
2. M. A. Naimark and A. I. Štern, Theory of Group Representations (Springer-Verlag, New York, 1982).
3. A. I. Shtern, “Extension of Pseudocharacters from Normal Subgroups,” Proc. Jangjeon Math. Soc. 18 (4), 427–433 (2015).
4. A. I. Shtern, “Extension of Pseudocharacters from Normal Subgroups, II,” Proc. Jangjeon Math. Soc. 19 (2), 213–218 (2016).
5. A. I. Shtern, “Description of Locally Bounded Pseudocharacters on Almost Connected Locally Compact Groups,” 23 (4), 551–552 (2016).