@article{MZM_2022_112_3_a14,
     author = {A. V. Ustinov},
     title = {A {Short} {Proof} of the {Landsberg--Schaar} {Identity}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {478--480},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {2022},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2022_112_3_a14/}
}