@article{MO_2020_3_a1,
     author = {S. V. Dvoryaninov},
     title = {{\textquotedblleft}A or {B{\textquotedblright}} and {\textquotedblleft}either {A} or {B{\textquotedblright}}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {8--13},
     year = {2020},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2020_3_a1/}
}