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1DEPARTMENT OF MATHEMATICS, UNIVERSITY OF CALIFORNIA (SAN DIEGO)
2DEPARTMENT OF ELECTRICAL ENGINEERING, UNIVERSITY OF SOUTHERN CALIFORNIA, LOS ANGELES
*
This research was supported by the U.S. Air Force Office of Scientific Research, Office of Aerospace Research, under AFOSR grant 1039-66 (Hubert Halkin, Department of Mathematics, University of California, San Diego) and under grant AF-AFOSR 1029-66 (Lucien W. Neustadt, Department of Electrical Engineering, University of Southern California, Los Angeles).