Renewable Energy Sources 2013 : 4th International Scientific Conference OZE 2013. Tatranské Matliare, Slovakia, May 21-23, 2013 - Cirák, Július, 1953-; Perný, Milan, 1985-; Smitková, Miroslava, 1977-; Al Akkad, Aiman; Báleš, Vladimír, 1949-; Benda, Vítězslav (Slovak University of Technology in Bratislava, 2013)