@article{ZNSL_2022_514_a0,
     author = {Yu. A. Alpin and A. E. Guterman and E. R. Shafeev},
     title = {An upper bound for the chainable index},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--17},
     year = {2022},
     volume = {514},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2022_514_a0/}
}