@article{MO_2019_3_a1,
     author = {G. A. Klekovkin},
     title = {On spatial spirals, finished},
     journal = {Matemati\v{c}eskoe obrazovanie},
     pages = {7--17},
     year = {2019},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MO_2019_3_a1/}
}