@article{DM_2020_32_3_a4,
     author = {N. P. Red'kin},
     title = {Minimal contact circuits for characteristic functions of spheres},
     journal = {Diskretnaya Matematika},
     pages = {68--75},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2020_32_3_a4/}
}