Submitted on: 19 August 2000.
Revised on: 26 September 2000.
Accepted on: 20 October 2000.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali
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Submitted on: 23 May 2021.
Revised on: 07 September 2021.
Accepted on: 31 October 2021.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali
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Submitted on: 11 March 1998.
Revised on: 09 April 1998.
Accepted on: 16 May 1998.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali
Submitted on: 11 November 2002.
Revised on: 29 December 2002.
Accepted on: 13 February 2003.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali
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Submitted on: 10 November 2011.
Revised on: 21 February 2012.
Accepted on: 21 April 2012.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali
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Submitted on: 04 September 2002.
Revised on: 30 October 2002.
Accepted on: 04 December 2002.
___________________Atti Accademia Peloritana dei Pericolanti-Classe di Scienze Fisiche Matematiche e Naturali