NEŽINSKÝ, Eduard. Frontier Approach to Environmental Efficiency: Least-Distance Benchmarks for Slovakia. In Prognostické práce. - Bratislava : Prognostický ústav – CSPV SAV, 2023. ISSN 1338-3590, 2023, vol. 15, no. 1, pp. 25-35. VEGA 2/0001/22.