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Submitted on: 18 October 2009.
Revised on: 10 January 2010.
Accepted on: 18 February 2010.
___________________CienciaUat---UNIV AUTONOMA TAMAULIPAS
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Submitted on: 06 April 2005.
Revised on: 17 May 2005.
Accepted on: 12 July 2005.
___________________CienciaUat---UNIV AUTONOMA TAMAULIPAS
Submitted on: 16 October 2005.
Revised on: 14 January 2006.
Accepted on: 13 February 2006.
___________________CienciaUat---UNIV AUTONOMA TAMAULIPAS
Submitted on: 11 January 2017.
Revised on: 26 February 2017.
Accepted on: 18 April 2017.
___________________CienciaUat---UNIV AUTONOMA TAMAULIPAS
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Submitted on: 09 February 2000.
Revised on: 06 June 2000.
Accepted on: 15 July 2000.
___________________CienciaUat---UNIV AUTONOMA TAMAULIPAS