“Ecology - the Question for the Whole Planet. An Interview With the President of Union of Enterprises for Energy Efficiency and Ecology (U4E) - Gonzag Pirey”, Статьи, Gosudarstvennaya Sluzhba, 18/1 (2016), 39-, https://gosudarstvennaya-sluzhba.owebs.ru/article/view/22200, accessed 8 Nov. 2026.