Sproge I, Curkina I, Jekabsone S, Tsilibina V, Rumyantseva J, Piletsky K. Production and Foreign Trade of Mineral Products in Latvia and Belarus. ETR [Internet]. 2015 Aug. 6 [cited 2024 May 7];1:240-5. Available from: https://journals.ru.lv/index.php/ETR/article/view/830