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Submitted on: 29 April 1999.
Revised on: 29 May 1999.
Accepted on: 11 June 1999.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Submitted on: 14 July 2011.
Revised on: 22 July 2011.
Accepted on: 13 August 2011.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
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