@article{MO_2020_4_a7,
     author = {S. V. Shvedenko},
     title = {Natural logarithm as a starting point for defining elementary functions},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {55--60},
     year = {2020},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2020_4_a7/}
}