Olga Preobrazhenskaya
https://en.wikipedia.org/wiki/Olga_Preobrazhenskaya_(director)
http://lafilmosfera.blogspot.com/2014/07/olga-preobrazhenskaya-pionera-del-cine.html
https://eltestamentodeldoctorcaligari.com/tag/olga-preobrazhenskaya/
https://ru.wikipedia.org/wiki/%D0%9F%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B6%D0%B5%D0%BD%D1%81%D0%BA%D0%B0%D1%8F,_%D0%9E%D0%BB%D1%8C%D0%B3%D0%B0_%D0%98%D0%B2%D0%B0%D0%BD%D0%BE%D0%B2%D0%BD%D0%B0
