Quantum electromagnetic nonlinearity affecting charges and dipole moments / T. C. Adorno, D. M. Gitman, A. E. Shabad, A. A. Shishmarev // Russian physics journal. 2017. Vol. 59, № 11. P. 1775-1787. URL: http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000578380