- A. M. Vershik, M. I. Graev, “Nonunitary Representations of the Groups of U(p, q)-currents for q ≥ p > 1”, J Math Sci, 232, № 2, 2018,
99 
- J. Marion, “A unitarization process for some non-locally compact topological groups”, Math Z, 214, № 1, 1993,
217