Here are the materials about Alexei published on the net.

1.    https://kliker.com.ua/kto-aleksej-strelnikov-i-chto-s-nim-sluchilos/

2. nashaniva.com›ru/305924

3. https://v-teme.com/pogib-aleksey-strelnikov/

4. https://ptj.spb.ru/blog/pamyati-alekseya-strelnikova/

5.https://daily.afisha.ru/brain/24944-esli-menya-arestuyut-mne-est-chto-pokazat-sokamernikam-pamyati-alekseya-strelnikova/

6. https://oteatre.info/umer-belorusskij-teatralnyj-deyatel-aleksej-strelnikov/

7. https://d1glzca3lpvfoz.cloudfront.net/post/strelnikov-pamyat/

8. https://mukola.net/aleksey-strelnikov-ot-chego-umer/

9. http://k-karpickaya.blogspot.com/2015/05/strelnikov.html