@article{MO_2020_2_a7,
     author = {A. Yu. Evnin},
     title = {Problems in calculus at student olympiads},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {55--76},
     year = {2020},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2020_2_a7/}
}