K. SINGH, Ashok; P. SINGH, R. Duct Lifetimes at Mid Latitudes. Periodica Polytechnica Electrical Engineering, [S. l.], v. 43, n. 1, p. 43–52, 1999. Disponível em: https://pp.bme.hu/ee/article/view/1015. Acesso em: 21 jul. 2025.