K. Abari, F. Mező, K. Mező, and J. Máth, “STRUCTURES OF DATABASES FOR IMPACT STUDIES OF DEVELOPMENT PROGRAMMES IN A FREE STATISTICAL SOFTWARE: IN THE SOFTWARE ’R’”, Különleges Bánásmód, vol. 1, no. 2, pp. 37–47, Jun. 2015, doi: 10.18458/KB.2015.2.37.