1. A Textbook of Histology;Bloom,1962
2. Christophorou et al. (1981). High Voltage Research (Breakdown Strengths of Gaseous and Liquid Insulators) and Environmental Effects of Dielectric Gases. Semiannual Report (April 1-September 30, 1980), Oak Ridge National Laboratory Report ORNL/TM-7624, 65–67.
3. The toxicity of fluorocarbons with special reference to chemical composition;Clayton;J. Occupat. Med.,1962
4. Positive ions in spark breakdown of SF6;Frees;J. Phys. D: Appl. Phys.,1981
5. Assessment of potential health effects of dielectric gases;Griffin,1980