Department of Thermal EngineeringOts, Arvo; Öpik, Ilmar; Õispuu, Leo; Arro, Hendrik; Prikk, Arvi; Mikk, Ilmar; Käär, Harri; Selg, VelloResearch activities / Tallinn Technical University1993 / p. 27-30 https://www.ester.ee/record=b1053754*est