1. National University of Science and Technology MISiS; Moscow Russia
2. School of Advanced Materials Engineering, Chonbuk National University; Jeonju 561-756 Korea
3. Nitride Crystals, Inc.; Deer Park USA
4. University ITMO; 49 Kronverkskiy Ave. Saint Petersburg 197101 Russia
5. Institute of Microelectronics Technology and High Purity Materials Russian Academy of Science; Chernogolovka Russia
6. Technological Institute for Superhard and Novel Carbon Materials; 7 Centralnaya St. Troitsk, Moscow 142190 Russia
7. Nitride Crystals Ltd.; pr. Engels 27 Saint Petersburg 194156 Russia