Growth of Scenedesmus obliquus under artificial flue gas with a high sulphur concentration neutralized with oil shale ashPodkuiko, Lara; Olt, Jüri; Kikas, TimoProceedings of the Estonian Academy of Sciences2017 / p. 151-158 : ill https://doi.org/10.3176/proc.2017.2.03 http://www.ester.ee/record=b2355998*est Preliminary investigation into mechanical properties of clay reinforced with natural fibresPeetsalu, Priidu; Resev, Jüri; Ruus, Aime; Menind, Andres; Kers, Jaan; Sepper, Sirli; Olt, JüriAgronomy research2010 / S1, p. 201-207 : ill Preliminary investigation of technological, physical and economic parameters of herbaceous biomass briquettesMenind, Andres; Oper, Liis; Kers, Jaan; Melts, Indrek; Olt, JüriLecture notes in information technology2012 / p. 134-140