1. Subterranean coal fire and conditions of formation of burned rocks at Angren;Abubakirov;Vopr. Geol. Uzb.,1962
2. Metamorphism produced by the burning of lignite beds in Dakota and Montana territories;Allen,1874
3. The weathering of phosphate deposits—geochemical and environmental aspects;Altschuler,1973
4. The Geochemistry of trace elements in marine phosphorites—Part 1. Characteristic abundances and enrichment;Altschuler,1980