PETROV, H.; PETROV, G. Digitization of the Arda cascade for the hydroelectric production - part I. Yearbook Telecommunications, [S. l.], v. 8, p. 65–71, 2021. DOI: 10.33919/YTelecomm.21.8.7. Disponível em: https://ojs.nbu.bg/index.php/YT/article/view/600. Acesso em: 1 oct. 2022.