@article{MO_2016_3_a1,
     author = {K. A. Lebedev},
     title = {On {Methodological} and {Scientific} {Principles} of {Creating} {School} {Manuals} of the {Series} {{\textquotedblleft}MSU} for {School{\textquotedblright}.} {I.} {Numerical} system (5{\textendash}6 classes)},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {3--20},
     year = {2016},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2016_3_a1/}
}