1. Space Research Institute, Moscow, Russia.
2. N.L. Dukhov All-Russian Institute of Automatics, Moscow, Russia.
3. Jet Propulsion Laboratory, Pasadena, California.
4. A.A. Blagonravov Institute of Mechanical Engineering, Moscow, Russia.
5. University of Arizona, Tucson, Arizona.
6. Joint Institute for Nuclear Research, Dubna, Russia.