http://graniru.org/opinion/portnikov/m.264013.html
https://meduza.io/feature/2017/09/15/prodolzhitelnost-zhizni-v-rossii-72-5-goda-eto-mnogo-ili-malo
https://meduza.io/news/2017/09/15/pritok-migrantov-v-rossiyu-snizilsya-za-minimuma-za-sem-let
https://www.radiosvoboda.org/a/28738100.html
https://grani-ru-org.appspot.com/Politics/m.264032.html
https://www.radiosvoboda.org/a/28738028.html