1. Thermal conductivity of rocks ardirs measurement on the divided-bar apparatus;Čermák;Trav. Inst. Géophys. Acad. Tehécosl. Sci., No. 274,1967
2. Dissipation of the temperature effect of drilling a well in Arctic Alaska;Lachen bruch;Geol. Survey Bull.,1959
3. Grundlagen der Wärmeübertragung (original in Russian);Michejew,1964
4. Map of July air temperature;Karský,1966
5. Heat flow in South Africa;Bullard,1939