Kazakov, Gennady     Optimization of natural illumination and the savings of energy of educational rooms concerning reconstruction of National University "Lviv Polytechnic" buildings [Текст] / Gennady Kazakov, Bogdan Shcherbatyuk, Olga Kahnych // Current issues of civil and environmental engineering : XII Intern. sci. conf., 17-19 Sept. 2009, Rzeszow, Poland : book of abstr. / Rzeszow univ. of technology. — Rzeszow, 2009. — P. 35.