https://vk.com/rvs.obrazovanie
https://sheba.spb.ru/shkola/index.htm

2019
https://sputnik.by/education/20180525/1035631998/kak-izmenitsya-ct-v-ehtom-godu-i-chego-zhdat-abiturientam-2019.html
2017
https://trv-science.ru/2017/06/06/nulevoi-uroven/
    !!! about links between science
    ! importance of final exam
2014
https://trv-science.ru/2014/07/01/egeh-ptica-dvojjka/
2011
http://scepsis.net/library/id_2977.html
2004
victor Dos - 5 rule of Arithmetics ru
    https://ufn.ru/tribune/trib110604.pdf
    http://www.ega-math.narod.ru/Arnold2.htm#note1