1. Borisov, V.V. and Utkin, A.B., J. Phys. A: Math. Gen., 1993, p. 4081.
2. Valiev, F.F., Tech. Phys. Lett., 2004, vol. 30, no. 3, p. 244.
3. Valiev, F.F., Bull. Russ. Acad. Sci.: Phys., 2011, vol. 75, no. 7, p. 1001.
4. Borisov, V.V., Elektromagnitnye polya neustanovivshikhsya tokov (Electromagnetic Fields of Unbalanced Current), St. Petersburg: S.-Peterb. Univ., 1996, p. 172.
5. Valiev, F.F., Proc. Int. Conf. “Days of Diffraction” (St. Petersburg, 2013), p. 151.