@article{DAN_1972_202_3_a3,
     author = {S. S. Vallander},
     title = {On the limit behavior of iteration sequences of certain quadratic transformations},
     journal = {Doklady Akademii Nauk},
     pages = {515--517},
     publisher = {mathdoc},
     volume = {202},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_3_a3/}
}