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M.J. Roberts, F.S. Lau, M.C. Mensinger, C.W. Schultz, R.K. Mehta, W.E. Lamont, S.H. Chiang, R. Venkatadri, M. Misra. "Pressurized fluidized-bed hydroretorting of Eastern oil shales -- Beneficiation. Topical report for Task 4, Beneficiation research." (1992)