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Submitted on: 27 February 2015.
Revised on: 19 March 2015.
Accepted on: 04 April 2015.
___________________Comunicacion y Hombre---UNIV FRANCISCO VITORIA
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Submitted on: 26 May 2001.
Revised on: 18 June 2001.
Accepted on: 02 July 2001.
___________________Comunicacion y Hombre---UNIV FRANCISCO VITORIA