[[1] Bakallbashi J., Goskolli E. e.a., 2015 Feasibility study of development in depth of Bulqiza north mine, Tirana]Search in Google Scholar
[[2] Qorlaze S., Gjoni V., 1988 Geological report on Bulqiza North Chromium Deposit 1984-1988, Tirana]Search in Google Scholar
[[3] Guda V, Goskolli E. e.a., 2001 Study of gas release in chromium mine of Albania, Tirana.]Search in Google Scholar
[[4] Nesimi R. e.a., 2014 Report of the results of geological drilling conducted in the mining of northern Bulqize Bulqiza]Search in Google Scholar
[[5] Bieniawski, Z.T., 1989 Engineering rock mass classifications. New York, Wiley]Search in Google Scholar
[[6] McPherson M.J., 1988 An analysis of the resistance and airflow characteristics of mine shafts, 4th International Mine Ventilation Congress, Brisbane, Australia.]Search in Google Scholar
[[7] Goskolli E. e.a., 1990 Microclimates and working conditions in the North Bulqize mine 1987-1990.]Search in Google Scholar