1. Latvian State Institute of Wood Chemistry, Dzerbenes Street 27, LV-1006 Riga, Latvia
2. Ltd. V.L.T., Murmuizas Street 11a, LV-4201 Valmiera, Latvia
3. Faculty of Natural Science and Technology, Riga Technical University, 6A Kipsalas Street, LV-1048 Riga, Latvia
4. Personal Protective Equipment Laboratory, Riga Technical University, Kipsalas 6B-242, LV-1048 Riga, Latvia