Ionela , C. D. (2008). Записки Горного института, 174, 210-212. извлечено от https://pmi.spmi.ru/pmi/article/view/7530

Ionela , C. D. (2008). Experimental researches for the reduction of the noxes during the burning of pit coal from Jiu Valley – Romania. Journal of Mining Institute, 174, 210-212. Retrieved from https://pmi.spmi.ru/pmi/article/view/7530