This application is a continuation-in-part of 09/449,334, filed on Nov. 24, 1999, now abandoned and having the same title and inventors as the present application; this application also claims the benefit of U.S. Provisional Application No. 60/139,168 filed Jun. 15, 1999, the entire teachings of which are incorporated herein by reference.
The invention was supported, in whole or in part, by a grant, number DMR-9701699, from the National Science Foundation. The Government has certain rights in the invention.
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Number | Date | Country | |
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60/139168 | Jun 1999 | US |
Number | Date | Country | |
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Parent | 09/449334 | Nov 1999 | US |
Child | 09/449576 | US |