@book { title = {Magyar Tudomány 2020/9}, year = {2020}, publisher = {Akadémiai Kiadó}, isbn = {}, doi = {}, URL = {https://mersz.hu/hivatkozas/matud202009_po-heading-id_Z78ZHOcv0kiLvR8tNYer3A_p17#matud202009_po-heading-id_Z78ZHOcv0kiLvR8tNYer3A_p17} }