D. . Stumbrienė, R. . Želvys, J. . Žilinskas, and A. . Jakaitienė, “Using PIRLS and TIMSS data for the assessment of efficiency and effectiveness of primary education in post-socialist and old democracy EU member states”, Lithuanian J. Statist., vol. 61, pp. 1–15, Dec. 2022, doi: 10.15388/LJS.2022.29667.