• 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
• Sulfur binding by ash in oil shale boilersArro, Hendrik; Prikk, Arvi; Pihu, TõnuOil shale2001 / p. 123-129 https://www.ester.ee/record=b1072685*est https://artiklid.elnet.ee/record=b1007236*est
• Sulphation and carbonization of oil shale CFBC ashes in heterogeneous systemsKuusik, Rein, keemik; Uibu, Mai; Toom, M.; Muulmann, Mari-Liis; Kaljuvee, Tiit; Trikkel, AndresOil shale2005 / 4S, p. 421-434 : ill https://artiklid.elnet.ee/record=b2352615*est
• Sulphation of Estonian calcareous rocksTrikkel, Andres; Aasa, Priit; Kuusik, Rein, keemikESTAC-7 : 7th European Symposium on Thermal Analysis and Calorimetry, Aug. 30 - Sept. 4, 1998, Balatonfüred, Hungary : book of abstracts1998 / p. 324
• 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