1. Lett, R.G. and Cugini, A.V. Proceedings of the DOE Direct Liquefaction Contractors’ Review Meeting, October 22, 1986.
2. Boehm, F.G., Caron, R.D., Banarjee, D.K. Energy and Fuels, 3, 116, 1989.
3. Lenz, U., Wawrzinek, J. and Giehr, A. Preprints of ACS Division of Fuel Chemistry, 33(1), 27, 1988.
4. Cugini, A.V., Lett, R.G. and Wender, I. Energy and Fuels, 3, 12, 1989,.
5. Fouda, S.A., Kelly, J.F. and Rahimi, P.M., Energy and Fuels, 3, 154, 1989