1Isobe T Analysis on the Charecteristic Curve and Its Egualion in Relation to the Centrifugal Mine Fans. Proc. of Int. symp. on Modern Coal Min. Technology Beijing China. 1987: 30-40.
2W. Dziurzynski. Numerical simulation of ventilation process computer programs, proceedings of the first school of mine ventilation. EMAG, Katowice, 1999: 303-309.