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- † Communicated by Professor A. H. Haddad. This work was supported in part by the U.S. Air Force under Grant AFOSR-68–1579, in part by the National Science Foundation under NSF Grant GK-3893 and in part by the Joint Services Electronics Program (U.S. Army, U.S. Navy and U.S. Air Force) under Contract DAAB-07–67-C-0199 with the Coordinated Science Laboratory, University of Illinois, Urbana, Illinois.