Ecology - the question for the whole planet. An interview with the president of Union of Enterprises for Energy Efficiency and Ecology (U4E) - Gonzag Pirey. Gosudarstvennaya Sluzhba, [S. l.], v. 18, n. 1, p. 39–39, 2016. Disponível em: https://gosudarstvennaya-sluzhba.owebs.ru/article/view/22200. Acesso em: 9 nov. 2026.