A. Alkahtani, Y. M., Abdussalam Ashour, K. and Zsarnóczai, J. S. (2016) “Factor analyses for economic growth in EU-28 and MENA-4 countries”, Review on Agriculture and Rural Development, 5(1-2), pp. 171–176. doi: 10.14232/rard.2016.1-2.171-176.