1. L. Oranje. Paper presented at the 14th World Gas Conference of the IGU, Toronto, Canada (1979).
2. J. L. K. Banell, A. G. Dixon, and T. P. Davies. inGas Quality: Proceedings of the Congress of ?Gas Quality-Specification and Measurement of Physical and Chemical Properties of Natural Gas.? Groningen, The Netherlands, April 1986, G. J. van Rossurn. ed. (Elsevier. Amsterdam. 1986). pp. 263?271.
3. K. S. Pedersen. Aa. Fredenslund, and P. Thomassen, inProperties of Oils and Natural Gases (Gulf, Houston. TX. 1989).
4. I. Lammers and J. de Swaan Arons.J. Chim. Ind. Genie Chim. 106:615 (1973).
5. L. Kuijk, R. 1. Beks. M. Struis. and A. L. C. Smit. IGT Gas Quality Measurement Symposium. Chicago (1991).