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2. “Statistics Manual”;Crow,1960
3. “Soil Thermal Characteristics in Relation to Underground Power Cables, Part III Soil Moisture Characteristics”;Fink;AIEE,1960
4. “Effect of Snow Cover on Upward Movement of Soil Moisture,”;Peck;ASCE Journal of the Irrigation and Drainage Division,1974
5. “Thermal Design of Underground Transmission Systems is Improved,”;Radhakrishna;Transmission & Distribution,1980