Cyrnek , C., & Sukiennik , M. (2006). Записки Горного института, 167(2), 313-315. извлечено от https://pmi.spmi.ru/pmi/article/view/8035

Cyrnek , C., & Sukiennik , M. (2006). The elements of marketing in Polish subterranean building industry. Journal of Mining Institute, 167(2), 313-315. Retrieved from https://pmi.spmi.ru/pmi/article/view/8035