Изменения

==Литература==

*https://ru.wikipedia.org/wiki/%D0%9B%D0%B0%D0%BD%D1%86%D0%B1%D0%B5%D1%80%D0%B3,_%D0%92%D0%BB%D0%B0%D0%B4%D0%B8%D0%BC%D0%B8%D1%80_%D0%98%D1%81%D0%B0%D0%B0%D0%BA%D0%BE%D0%B2%D0%B8%D1%87