J. Theo Kloprogge, Huada Ruan, Loc V. Duong, & Ray L. Frost. (2001). FT-IR and Raman microscopic study at 293 K and 77 K of celestine, SrS04, from the middle triassic limestone (Muschelkalk) in Winterswijk, The Netherlands. Netherlands Journal of Geosciences, 80(1), 41-47. https://doi.org/10.1017/S0016774600022307