- Increasing natural daylight levels in atrium type buildingsKoppel, Tarmo; Tint, Piia56th International Riga Technical University Conference "Scientific Conference on Economics and Entrepreneurship SCEE'2015" : proceedings2015 / p. 154-155
- Research of parameters of light emitting diode lamps and their suitability for lighting of working areasPaju, JanaAgronomy research2013 / p. 449-456 : ill