KULTAN, Jaroslav et al. Climatic conditions of Astana for the development of alternative energy sources. In Renewable energy sources 2013 : proceedings of the 4th international scientific conference OZE: Tatranské Matliare, Slovakia, May 21-23, 2013. - Bratislava : Slovak University of Technology in Bratislava, 2013. ISBN 978-80-89402-64-9, p. 247-253.