https://www.google.com/url?q=https://pea.lib.pte.hu/bitstream/handle/pea/23953/izsak-norbert-phd-2021.pdf%3Fsequence%3D1%26isAllowed%3Dy&sa=U&ved=2ahUKEwiAoouhiK2CAxU82gIHHQmSAEQQFnoECAkQAg&usg=AOvVaw3tfuL_MRnEDtHEeX6gGX6-
