Биография Фейгина Марка [Biography of mark Feygin] (in Russian). obeschania.ru. 8 October 2015. Archived from the original on 4 October 2015. Retrieved 7 July 2018.
Биография Фейгина Марка [Biography of mark Feygin] (in Russian). obeschania.ru. 8 October 2015. Archived from the original on 4 October 2015. Retrieved 7 July 2018.