Kursk State University Kursk, Russia (July 25-31, 2016).
Euler International Mathematical Institute St. Petersburg, Russia (August 1-7, 2016).
Chuo University Tokyo, Japan (January 20-22, 2017).
Euler International Mathematical Institute St. Petersburg, Russia (May 22-27, 2017).
Leibniz University Hannover, Germany (Oct 4-6, 2017).