1. S. M. Thesis, Department of Mechanical Engineering, M.I.T. (Jan. 1976).
2. ?The Physics of Electricity and Magnetism,? pp. 199-200, John Wiley and Sons, New York (1966).
3. ?Static and Dynamic Electricity,? pp. 10-12, McGraw-Hill, New York (1968).
4. ed., ?Handbook of Chemistry and Physics,? pp. E55-E58, CRC Press (1973).
5. Information obtained through personal contact with USM Corporation.