1. Abdel‐Hadi O. N. (1979). “Flow of heat and water around underground power cables ” thesis presented to the University of California at Berkeley Calif. in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
2. A Transient‐Flow Method for Determination of Thermal Constants of Insulating Materials in Bulk Part I—Theory
3. Brandon T. L. (1985). “Thermal conductivity and thermal instability of sand ” thesis presented to the University of California at Berkeley Calif. in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
4. Brookes A. S. and McGrath M. H. (1960). “Practical application: Trench design and construction.” Part V AIEE Committee Report Soil thermal characteristics in relation to underground power cables AIEE Trans. PAS‐79.
5. Debye P. (1914). Vortrange uber die Kinetische Theorie der Materie und Elektriztat . Leibzig und Berlin (in German).