@article{DAN_1978_239_1_a15,
     author = {V. B. Larin},
     title = {Optimization of periodic systems},
     journal = {Doklady Akademii Nauk},
     pages = {67--70},
     publisher = {mathdoc},
     volume = {239},
     number = {1},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_239_1_a15/}
}