@article{DAN_1991_316_1_a6,
     author = {Yu. L. Ershov},
     title = {Characterization of {Kochen} rings of $PC_M$-fields},
     journal = {Doklady Akademii Nauk},
     pages = {33--36},
     publisher = {mathdoc},
     volume = {316},
     number = {1},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_1_a6/}
}