@article{SM_2024_215_4_a4,
     author = {Yu. V. Malykhin},
     title = {Widths and rigidity},
     journal = {Sbornik. Mathematics},
     pages = {543--571},
     publisher = {mathdoc},
     volume = {215},
     number = {4},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2024_215_4_a4/}
}