@article{IVM_2024_4_a8,
     author = {V. S. Sekorin},
     title = {On undecidability of unary non-nested {PFP-operators} for one successor function theory},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {89--93},
     year = {2024},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2024_4_a8/}
}