1. NEWS FOCUS
2. Hazardous waste research
3. T.L. Wolford, U.S. Patent No. 4,423,024, Dec. 27, 1983; D.A. Livingston and J.P. Surls, U.S. Patent No. 4,587,116, May 6, 1986; A.D. Harley, U.S. Patent No. 4,816,609, March 28, 1989; T. Dockner, M. Sauserwald, H. Krug and M. Irgang, U.S. Patent No. 4,943,671, July 24, 1990.