1. GPA Standard 2145‒84, p. 2.
2. GPA Reference Bulletin, Heating Value As a Basis for Custody Transfer of Natural Gas (1984 Draft).
3. AGA Gas Measurement Manual, Section 11A.2 Determination of Heating Value of Gas, p. IIA2.1 ff.
4. Installation and Operation of Recording Calorinators, A. E. Kersey ISHM #64, 1989, p. 93 ff.
5. Field Deployable Natural Gas Energy Meter, Lewis and Greefield, Sales Information 1989.