@book { title = {Magyar Tudomány 2021/04}, year = {2021}, publisher = {Akadémiai Kiadó}, isbn = {}, doi = {}, URL = {https://mersz.hu/hivatkozas/matud202104_po-heading-id_ubWv3L1GUEKDQbHTQOg8dw_p3#matud202104_po-heading-id_ubWv3L1GUEKDQbHTQOg8dw_p3} }