2013API MPMS 14.3.3-2013 Orifice Metering of Natural Gas and Other Related Hydrocarbon Fluids-Concentric@ Square-edged Orifice Meters Part 3: Natural Gas Applications (FOURTH EDITION)
1992API MPMS 14.3.3-1992 Manual of Petroleum Measurement Standards Chapter 14 - Natural Gas Fluids Measurement Section 3 - Concentric@ Square-Edged Orifice Meters Part 3 - Natural Gas Applications