Sintering and fouling characterization of ashes with high calcium oxide contentOts, Arvo; Parve, Teet; Skrifvars, Bengt-Johan; Hupa, MikkoProceedings of the 13th International Conference on Fluidized Bed Combustion. Vol. 21995 / [13] p.: ill The influence of temperature and gas composition on the sintering of Estonian oil shale ashParve, Teet; Skrifvars, Bengt-Johan; Ots, Arvo; Hupa, Mikko1994 The sintering of Estonian oil shale ashesParve, Teet; Ots, Arvo; Skrifvars, Bengt-Johan; Hupa, MikkoOil shale1995 / 4, p. 341-356: ill The sintering tendency of ash from calcium rich oil shaleOts, Arvo; Parve, Teet; Skrifvars, Bengt-Johan; Hupa, MikkoJournal of the Institute of Energy1996 / Dec., p. 192-200