1. Akhiezer, A.I. and Berestetskii, V.B., Kvantovaya elektrodinamika (Quantum Electrodynamics), Moscow: Fizmatgiz, 1981.
2. Kadmensky, S.G. and Ivankov, Yu.V., Phys. At. Nucl., 2014, vol. 77, no. 8, p. 119.
3. Kadmensky, S.G. and Ivankov, Yu.V., Phys. At. Nucl., 2014, vol. 77, no. 12, p. 1605.
4. Kadmensky, S.G., Ivankov, Yu.V., and Lyubashevsky, D.E., Phys. At. Nucl., 2017, vol. 80, no. 5, p. 903.
5. Kadmensky, S.G., Titova, L.V., and Lyubashevsky, D.E., Phys. At. Nucl., 2020, vol. 83, no. 4, p. 326.