@article{KUTGS_1976_9_a12,
     author = {N. V. Talantova and A. P. Shirokov},
     title = {Three-step groups of linear fractional substitutions of a dual variable as affine collineations},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {105--113},
     publisher = {mathdoc},
     volume = {9},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1976_9_a12/}
}