Krzemień , A., & Dyszy , A. (2007). Записки Горного института, 170(2), 200-202. извлечено от https://pmi.spmi.ru/pmi/article/view/7750

Krzemień , A., & Dyszy , A. (2007). Occupational health and safety management rules according to pier-merit program in polish coal mines. Journal of Mining Institute, 170(2), 200-202. Retrieved from https://pmi.spmi.ru/pmi/article/view/7750