The work of GLB was supported by the Office of Naval Research under Contract N00014-92-J-1089. The work of HOK was supported by the National Science Foundation under contract DMS 90-61311 and by the Office of Naval Research under Contract N00014-90-J-1382. The authors wish to express their appreciation to Ralph Milliff for his very constructive review and to Nita Fullerton for her technical editing.
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