1. Osetinskii, N.I., Vasil’ev, O.O., and Vainshtein, F.S., Differ. Uravn., 2005, vol. 41, no. 11, pp. 1533–1539.
2. Osetinskii, N.I. and Vasil’ev, O.O., Nelineinaya Dinamika i Upravlenie, 2006, vol. 5, pp. 181–189.
3. Osetinskii, N.I., Vasil’ev, O.O., and Vainshtein, F.S., Differ. Uravn., 2006, vol. 42, no. 11, pp. 1532–1538.
4. Osetinskii, N.I., Itogi Nauki Tekh. Ser. Sovrem. Mat. Prilozh. Temat. Obz., 1995, vol. 29, pp. 6–94.
5. Procesi, C., Adv. Math., 1976, vol. 19, pp. 306–381.