1. National Research and Development Institute for Textile and Leather, Leather and Footwear Institute, 93 Ion Minulescu Street; Bucharest 031215 Romania
2. Petru Poni Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley; Iasi 700487 Romania
3. National Institute for Lasers, Plasma and Radiation Physics, 409 Atomistilor Street; Magurele 077125 Romania