1. Geochemical characteristic of brown vitrinitic coals;Adamchuk;Izv. Akad. nauk Tadž. SSR, Otd. Fiz.-Mat. Geol.-Him. Nauk,1985
2. Chemical composition of the feed coal, fly ash and bottom ash;Affolter,1998
3. Geochemistry, mineralogy, and technological properties of the main Stephanian (Carboniferous) coal seams from the Puertollano Basin, Spain;Alastuey;Int. J. Coal Geol.,2001
4. Trace elements in lignites of Taldu–Dyurgun coal deposit (Altai Republic) and its utility problems;Arbuzov;Itogi i perspectivy geol. izuchen. Gornogo Altaya: Mater. nauch.-prakt. conf. Gorno–Altaisk: Altai–Geo,2000
5. Trace element-potential of the Siberian coals. Geology, prospection and exploration on the Siberian ore mineral reciurces;Arbuzov;Tomsk,2001