1. Institute of Macromolecular
Compounds, Russian Academy of Sciences,
Bol’shoi pr. 31 (V.O.), St. Petersburg, 199004 Russia
2. Department of Physics, St. Petersburg State University, Ul’yanovskaya
str. 1, Petrodvorets, St. Petersburg, 198504 Russia
3. Theory of Polymers and Soft Matter
Group, Technische Universiteit Eindhoven, PO Box 513, 5600 MB Eindhoven, The Netherlands