Submitted on: 26 February 2007.
Revised on: 10 March 2007.
Accepted on: 21 March 2007.
NULL
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Submitted on: 14 November 2019.
Revised on: 06 December 2019.
Accepted on: 30 December 2019.
NULL
Submitted on: 08 May 2009.
Revised on: 18 June 2009.
Accepted on: 04 July 2009.
Revista Economia---PONTIFICIA UNIV CATOLICA PERU
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Submitted on: 03 August 2009.
Revised on: 29 August 2009.
Accepted on: 10 September 2009.
NULL
Submitted on: 19 December 2013.
Revised on: 03 January 2014.
Accepted on: 28 January 2014.
NULL