@article{MO_2024_109_1_a0,
     author = {A. N. Afanasyev},
     title = {Directed angles and isogonality},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {2--11},
     publisher = {mathdoc},
     volume = {109},
     number = {1},
     year = {2024},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2024_109_1_a0/}
}