1. BARLETT, N, CHEMICAL & ENGINEERING NEWS 41: 36 (1963).
2. EDWARDS, A.J., PROCEEDINGS OF THE CHEMICAL SOCIETY: 235 (1963).
3. Gillespie, R. J., Noble Gas Compounds: 333 (1963).
4. Hyman, H. H., Noble Gas Compounds: 275 (1963).
5. Hyman H. H. paper presented at 145th meeting of American Chemical Society New York Sept. (1963).