JANČOVIČOVÁ BOGNÁROVÁ, Kristína - BAŠOVÁ, Alena. Evaluation of economic efficiency in the energetic sector. In Finance and risk 2015. International scientific conference. Finance and risk 2015 : proceedings of the 17th international scientific conference : 23. - 24. november 2015, Bratislava, Slovak Republic. - Bratislava : Publishing house EKONÓM, 2015. ISBN 978-80-225-4218-0, s. 268-275. VEGA 1/0913/14.