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Submitted on: 04 September 2002.
Revised on: 18 September 2002.
Accepted on: 04 October 2002.
Physics of Wave Phenomena
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Submitted on: 12 November 2000.
Revised on: 11 December 2000.
Accepted on: 30 December 2000.
Physics of Wave Phenomena---PLEIADES PUBLISHING INC
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