@article{ZNSL_2023_527_a8,
     author = {K. {\CYRA}. Sintsova},
     title = {Inverse theorem for approximation on subsets of a domain with cups},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {204--220},
     publisher = {mathdoc},
     volume = {527},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2023_527_a8/}
}