@article{MO_2007_44_4_a0,
     author = {S. V. Dvoryaninov},
     title = {What is a {Group} of {Functions}},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {2--8},
     publisher = {mathdoc},
     volume = {44},
     number = {4},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2007_44_4_a0/}
}