A dynamic lighting system for workplaces deficient of daylightKoppel, Tarmo; Tint, PiiaEnvironmental health risk VII2013 / p. 105-116 : ill 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