1. Alipour Asll M. 2008. Diagenetic rare earth elements remobilization in organic-rich black shales of Marvast, Yazd, Iran. International Geological Congress, Oslo.
2. Bartels C. Briggs D. E. G. Brassel G. 1998. The fossils of the Hunsrück Slate: marine life in the Devonian. Cambridge Palaeobiology, 3. Cambridge University Press, Cambridge.
3. Sedimentary pyrite formation
4. Discoveries on graptolites by X-ray studies;Bjerreskov;Acta Palaeontologica Polonica,1978
5. Bjerreskov M. 1994. Pyrite diagenesis of graptolites from Bornholm, Denmark. In: Chen X. Erdmann B.-D. Ni Y.-N. (eds) Graptolite research today. Nanjing University Press, 217–222.