2013GOST 147-2013 Solid mineral fuel. Determination of gross calorific value and calculation of net calorific value
1995GOST 147-1995 Solid mineral fuel. Determination of the highest combustion heat and calculation of the lowest combustion heat
1970GOST 147-1974 Brown coals, hard coals, anthracite, combustible shales, turf and briquettes. Method for determination of specific heat of combustion