Submitted on: 16 January 2006.
Revised on: 06 February 2006.
Accepted on: 04 March 2006.
OPTO-ELECTRONICS REVIEW
Submitted on: 07 December 1999.
Revised on: 31 December 1999.
Accepted on: 27 January 2000.
OPTO-ELECTRONICS REVIEW---POLISH ACAD SCIENCES
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