Modeling of decomposition and sulphation of oil shale carbonates on the basis of natural limestoneTrikkel, Andres; Kuusik, Rein, keemikOil shale2003 / 4, p. 491-500 : ill https://artiklid.elnet.ee/record=b1014398*est

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Sulphation of oil shale ash under atmospheric and pressurized combustion conditionsKülaots, Indrek; Yrjas, Patrik; Hupa, Mikko; Ots, Arvo1995 https://www.ester.ee/record=b2087107*est

О сульфатизации летучей золы эстонских сланцев в атмосфере SO2+воздухArro, Hendrik; Öpik, Ilmar1958 https://www.ester.ee/record=b1381584*est https://digikogu.taltech.ee/et/Item/d94e7aac-a84e-4862-a549-2b6efbfde287