@article{DAN_1980_254_5_a13,
     author = {V. S. Ryaben'kii and A. Ya. Belyankov},
     title = {Difference potentials and projections},
     journal = {Doklady Akademii Nauk},
     pages = {1080--1084},
     publisher = {mathdoc},
     volume = {254},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_254_5_a13/}
}