https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B0%D0%BD%D0%BE%D1%81%D1%82%D1%80%D0%B0%D1%82%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B9_%D1%8F%D0%B7%D1%8B%D0%BA язык протоукров