THEORY OF CATASTROPHES REGARDING THE OPERATION OF A DC ELECTRIC MOTOR WITH SERIES EXCITATION. REVUE ROUMAINE DES SCIENCES TECHNIQUES — SÉRIE ÉLECTROTECHNIQUE ET ÉNERGÉTIQUE, [S. l.], v. 68, n. 1, p. 90–95, 2023. DOI: 10.59277/RRST-EE.2023.68.1.15. Disponível em: https://journal.iem.pub.ro/rrst-ee/article/view/315.. Acesso em: 16 may. 2024.