Submitted on: 01 February 2012.
Revised on: 27 April 2012.
Accepted on: 19 June 2012.
___________________Bulletin of Geophysics and Oceanography
Submitted on: 15 January 1998.
Revised on: 25 April 1998.
Accepted on: 20 June 1998.
___________________Bulletin of Geophysics and Oceanography
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Submitted on: 05 September 1998.
Revised on: 30 November 1998.
Accepted on: 06 January 1999.
___________________Bulletin of Geophysics and Oceanography