@article{CHEB_2024_25_5_a13,
     author = {A. O. Yulina},
     title = {Variational problems in the works of academician {O.~I.~Somov.} {Brachistochrone} and tautochrone},
     journal = {\v{C}eby\v{s}evskij sbornik},
     pages = {216--227},
     year = {2024},
     volume = {25},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CHEB_2024_25_5_a13/}
}