@article{DAN_1991_317_2_a13,
     author = {V. G. Pokotilo},
     title = {Optimization of a priori observations},
     journal = {Doklady Akademii Nauk},
     pages = {312--315},
     publisher = {mathdoc},
     volume = {317},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_2_a13/}
}