1. Fischer−Tropsch Refinery Catalysis, Sasol Technology Research and Development, P.O. Box 1, Sasolburg 1947, South Africa
2. Sasol Technology (Pty) Ltd, P.O. Box 1, Sasolburg 1947, South Africa
3. Sasol Technology Fuels Research, P.O. Box 1, Sasolburg 1947, South Africa