@article{UZKU_1968_128_3_a3,
     author = {V. V. Kolyan},
     title = {The geometry of circles in three-dimensional conformal space},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {24--30},
     year = {1968},
     volume = {128},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_1968_128_3_a3/}
}