Krache, L., et al. “Structural, Elastic, Electronic and Optical Properties Study of Hexahalometallate Single Crystals X2SnBr6 (X = Rb, Cs)”. Acta Physica Polonica A ISSN 1898-794X , vol. 143, no. 1, Jan. 2023, p. 3, https://doi.org/10.12693/APhysPolA.143.3.