BÜTI, Gy. THE SINGULAR PERTURBATION THEORY OF DIFFERENTIAL EQUATIONS IN CONTROL THEORY Periodica Polytechnica Electrical Engineering, [S. l.], v. 10, n. 2, p. 85–97, 1966. Disponível em: https://pp.bme.hu/ee/article/view/5213. Acesso em: 3 jul. 2024.