https://jceeas.bdi.uni-obuda.hu/index.php/jceeas/issue/view/10
https://jceeas.bdi.uni-obuda.hu/index.php/jceeas/article/view/199/264
https://jceeas.bdi.uni-obuda.hu/index.php/jceeas/issue/view/10
https://jceeas.bdi.uni-obuda.hu/index.php/jceeas/article/view/199/264