Optical Spectra of Baryte, BaSO₄

• Isetti G (1967) Color and pleochroism of baryte. Periodico di Mineralogia. 36, 25-41. (in Italian)
  
• Bershov LV, Samoilovich MI, Tarashchan AN, Martirosyan VO (1969) Inorganic radicals in natural barium sulfate. Izvestiya Akademii Nauk SSSR, Neorganicheskie Materialy 5, 1052-6. (In Russian)

•  Bakhtin AI, Khasanov RA, Vinokurov VM (1973) Electron paramagnetic resonance and optical absorption spectra of some defect centers in barytes and celestites. Edited by Vinokurov VM. Sostav, Strukt. Svoistva Miner. (1973), 84-90.  In Russian

• Bartoshinsky VZ, Shumsky AA, Larkiov AL, Dersky LS (1991) Paramagnetic and optically active centers in barytes of the Ukraine (in Russian). Mineralogicheskii Zhurnal 13,73-78.

• Buhl JC, Ruscher CH, Klanhardt K (2003) Blue baryte in Iberg-Wintergerg massif at Bad Grund/Harz. Aufschluss 54, 111-114 (in German)