1. Max-Born-Institut für nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489 Berlin, Germany
2. Saint-Petersburg State University, 199034 Universitetskaya Emb. 7-9, St. Petersburg, Russia
3. Peter the Great St. Petersburg Polytechnic University, 195251 Polytechnicheskaya st. 29, St. Petersburg, Russia