Ahn , E.-Y. (2007). Записки Горного института, 170(2), 42-45. извлечено от https://pmi.spmi.ru/pmi/article/view/7710
Ahn , E.-Y. (2007). Economic impact analysis of national natural gas storage. Journal of Mining Institute, 170(2), 42-45. Retrieved from https://pmi.spmi.ru/pmi/article/view/7710