@article{DAN_1957_113_5_a18,
     author = {I. B. Bersuker},
     title = {Concerning a theorem on the sum of oscillator forces for alkali metals},
     journal = {Doklady Akademii Nauk},
     pages = {1017--1019},
     publisher = {mathdoc},
     volume = {113},
     number = {5},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_5_a18/}
}