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