@article{DAN_1989_306_2_a7,
     author = {I. K. Rystsov},
     title = {A lower bound for the time of addition of two numbers},
     journal = {Doklady Akademii Nauk},
     pages = {290--292},
     publisher = {mathdoc},
     volume = {306},
     number = {2},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_2_a7/}
}