BÉDA, Gy. THE GENERALIZED D’ ALEMBERT-LAGRANGE EQUATION. Periodica Polytechnica Mechanical Engineering, [S. l.], v. 34, n. 1-2, p. 33–35, 1990. Disponível em: https://pp5.omikk.bme.hu/me/article/view/5605. Acesso em: 10 feb. 2025.