@article{MO_2018_2_a3,
     author = {S. N. Sazonov},
     title = {A method of deriving the {Wallis} formula and of decomposition of hyperbolic functions into infinite products},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {40--43},
     year = {2018},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2018_2_a3/}
}