ŽITNÝ, Rastislav et al. DEA method application in selected hotels in the Nitra region. - Registrovaný: Scopus. In APLIMAT 2017. conference on applied mathematics. APLIMAT 2017 : 16th conference on applied mathematics : proceedings : Bratislava, January 31 - February 2, 2017. - Bratislava : Vydavateľstvo Spektrum STU, 2017. ISBN 978-80-227-4650-2, pp. 1794-1801. VEGA 1/0067/15.