@article{MO_2021_2_a2,
     author = {V. N. Novikov},
     title = {On inequalities in a tetrahedron},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {18--27},
     year = {2021},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2021_2_a2/}
}