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2. aReagan, W. K.(Phillips Petroleum Company) EP 0417477, 1991.
3. bKnudsen, R. D.; Freeman, J. W.; Lashier, M. E.(Phillips Petroleum Company) US 5563312, 1996.
4. cFreeman, J. W.; Buster, J. L.; Knudsen, R. D.(Phillips Petroleum Company) US 5856257, 1999.
5. dReagan, W. K.; Freeman, J. W.; Conroy, B. K.; Pettijohn, T. M.; Benham, E. A.(Phillips Petroleum Company) EP 0608447, 1994.