@article{10_14736_kyb_2020_4_0722,
     author = {P\'alv\"olgyi, D\"om\"ot\"or},
     title = {The range of non-linear natural polynomials cannot be context-free},
     journal = {Kybernetika},
     pages = {722--726},
     publisher = {mathdoc},
     volume = {56},
     number = {4},
     year = {2020},
     doi = {10.14736/kyb-2020-4-0722},
     mrnumber = {4168532},
     zbl = {07286043},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.14736/kyb-2020-4-0722/}
}