فهرس المقالات Nina Chala المقاله 1 - Competencies of Personnel in Economy 4.0: Challenges and Solutions 20.1001.1.22519904.2021.14.3.8.3 10.22094/joie.2020.677818 Nina Chala Oksana Poplavska Nataliya Danylevych Mariya Maksma Journal of Optimization in Industrial Engineering , العدد 29 , السنة 14 , تابستان 2021
