@book { title = {Magyar Tudomány 2021/09}, year = {2021}, publisher = {Akadémiai Kiadó}, isbn = {}, doi = {}, URL = {https://mersz.hu/hivatkozas/matud202109_po-heading-id_qcVp8kMAp0yMuPTJdYg9Aw_p6#matud202109_po-heading-id_qcVp8kMAp0yMuPTJdYg9Aw_p6} }