GRUSHKA, Ya. I. Self-consistent translational motion of reference frames and sign-definiteness of time in universal kinematics. Methods of Functional Analysis and Topology, [S. l.], v. 24, n. 2, p. 107–119, 2018. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/689. Acesso em: 15 dec. 2025.