GOST 22667-1982 Combustible natural gases. Calculation method for determination of calorific value, specific gravity and Wobbe index*, 2024-04-20 Update
GOST 23781-1987 Natural combustible gases. Chromatographic method for determination of component composition*, 2024-04-20 Update
GOST 27193-1986 history
1986GOST 27193-1986 Natural combustible gases. Method for determination of calorific value with water calorimeter