1. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
2. New Jersey Institute of Technology; Newark New Jersey USA
3. IZMIRAN; Troitsk Russia
4. IPST; University of Maryland; College Park Maryland USA
5. Physics and Astronomy Department; University of Calgary; Calgary Alberta Canada
6. School of Physics and Astronomy; University of Minnesota; Minneapolis Minnesota USA
7. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
8. The Aerospace Corporation; Los Angeles California USA