. . . . . "1981" . . . "1981-10-18" . . . . . . . "Ivan Losev (mathematician)" . . . . . "Ivan Losev" . . . . . . . . . . "\u0406\u0432\u0430\u043D \u0412\u0430\u0434\u0437\u0456\u043C\u0430\u0432\u0456\u0447 \u041B\u043E\u0441\u0435\u045E" . . . . . . . . . . . . . . . . "Ivan Losev (mathematician)" . . . . . . . . . . . . . .