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Submitted on: 10 April 2001.
Revised on: 05 May 2001.
Accepted on: 27 May 2001.
POLYHEDRON---PERGAMON-ELSEVIER SCIENCE LTD
Submitted on: 05 April 2000.
Revised on: 17 April 2000.
Accepted on: 06 May 2000.
POLYHEDRON
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