Todor Dimov, Ilia Iliev and Antonina Hristova (2021) “Recent Study of Optical Activity and Faraday Rotation around the Edge Absorption of the Crystals \(Bi_{12}SiO_{20}\) and \(Bi_{12}SiO_{20}\):M (M = Co, Fe)”, Advanced Aspects of Engineering Research Vol. 16, pp. 1–7. doi: 10.9734/bpi/aaer/v16/8222D.