Corrosion of air preheater tubes of oil shale CFB boiler. Part 1, Dew point of flue gas and low-temperature corrosionPihu, Tõnu; Arro, Hendrik; Prikk, Arvi; Rootamm, Rein; Konist, AlarOil shale2009 / 1, p. 5-12 : ill https://artiklid.elnet.ee/record=b1141180*est