7Waston William E, Tepp Hans G, Cohen Morton H. Apparatus and method for the manufacture of fluorides: US, 3336111[P]. 1967-08-15.
8Denisov N T, Efimov O N, Shuvalov V F, et al. Method of producing hydrazing: US, 3703354[P]. 1975-11-21.
9Boudene C, Cluet J L, Keib G, et al. Identifica- tion and study of some properties of compounds resulting from the decomposition of SF6 under the effect of electrical arcing in circuit-breakers[J]. Revue Generale Electricite, 1974(special issue): 45-78.
