1. Standard method for proximate analysis of coal and coke (D3172-73);ASTM,1988
2. Standard method for ultimate analysis of coal and coke (D3176-84);ASTM,1988
3. Standard test method for bulk density of peat and peat products (D4531-86);ASTM,1989
4. Determination of the sorption capacity of peat with respect to petroleum products;Bel'kevich;Vestsi Akad. Navuk BSSR Ser. Khim. Navuk,1983