@article{TAC_2021_37_a12,
     author = {Nima Rasekh},
     title = {Every elementary higher topos has a natural number object},
     journal = {Theory and applications of categories},
     pages = {337--377},
     publisher = {mathdoc},
     volume = {37},
     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TAC_2021_37_a12/}
}