SKRYPNIK, W. I. On the post-Darwin approximation of the Maxwell – Lorentz equations of motion of point charges in the absence of neutrality. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 1, p. 117–128, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1423. Acesso em: 5 dec. 2025.