Olczyk, M. and Kujawska, J. 2026. Effectiveness of European Green Deal implementation in EU countries: a DEA/Benefit-of-the-Doubt approach. Ekonomia i Prawo. Economics and Law. 25, 2 (Jun. 2026), 175–198. DOI:https://doi.org/10.12775/EiP.2026.8.