1. The gas content of seams as a function of the tectonics of coal deposits;Bagrintseva;Cerchar Ref. F31/31.618,1959
2. Characteristic Properties of Seams of Kuznets Coalfield which are prone to Outbursts of Gas,1958
3. Fissuring and Friability;Alpern;Documents Techniques des Charbonnages de France No. 5,1963