1. National Institute of Research and Development for Optoelectronics; Magurele Ilfov Romania
2. Leibniz Institute for Tropospheric Research (IfT); Leipzig Germany
3. Gwangju Institute of Science and Technology (GIST); Buk-Gu Gwangju Republic of Korea
4. Now at University of Hertfordshire College; Hatfield, Herts United Kingdom
5. Science Systems and Applications; NASA Langley Research Center; Hampton VA USA
6. Physics Instrumentation Center; Troitsk Moscow Russia