@article{MO_2023_4_a1,
     author = {M. A. Gorelov},
     title = {A new look at an old problem},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {10--22},
     year = {2023},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2023_4_a1/}
}