@article{MO_2022_1_a2,
     author = {A. N. Afanasyev},
     title = {Trigonometry and problem solving in geometry},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {12--20},
     year = {2022},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2022_1_a2/}
}