@article{MO_2019_3_a4,
     author = {A. Yu. Evnin and Yu. A. Ignatov},
     title = {Problems on linear algebra at higher school students' olympiads},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {26--48},
     year = {2019},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2019_3_a4/}
}