ELEK, Tibor. ÜBER DAS BEGRIFFSSYSTEM DER VIERERVEKTOREN IN DER RELATIVISTISCHEN MECHANIK Periodica Polytechnica Mechanical Engineering, [S. l.], v. 14, n. 1, p. 107–127, 1970. Disponível em: https://pp.bme.hu/me/article/view/6101. Acesso em: 19 may. 2024.