1. J. H. Frick in “Hazardous Waste Management”, edited by J. J. Pierce and P. A. Vesilind (Ann Arbor Science) p. 9.
2. R. W. Regan, in “Hazardous and Toxic Wastes: Technology, Management, and Health Effects”, edited by S. K. Majumdar and E. W. Miller (The Pennsylvania Academy of Sciences) p. 2.
3. I. A. Sobolev, G. V. Makarchenko, S. V. Stefanovskii and F. A. Lifanov, Steklo i Kemanika
3 (1991) 8.
4. E. R. Vance, S. Urquhardt, D. Anderson and I. M. George, in “Advances in Ceramics”, Vol. 20: “Nuclear Waste Management II”, edited by D. E. Clark, W. B. White and A. J. Machiels (American Ceramic Society, Ohio. 1986) p. 249.
5. L. R. Bunnell, G. D. Maupin and K. H. Oma, ibid.in p. 167.