@article{MO_2019_2_a2,
     author = {G. A. Klekovkin},
     title = {On spatial spirals},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {20--30},
     year = {2019},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2019_2_a2/}
}