Submitted on: 11 October 2014.
Revised on: 23 November 2014.
Accepted on: 08 December 2014.
Region et Developpement---EDITIONS L HARMATTAN
http://reply.papertrans.cn/3/263/26213/26213-32.png
Submitted on: 04 July 2007.
Revised on: 14 July 2007.
Accepted on: 10 August 2007.
NULL
http://reply.papertrans.cn/3/263/26213/26213-34.png
http://reply.papertrans.cn/3/263/26213/26213-35.png
Submitted on: 09 August 2005.
Revised on: 20 September 2005.
Accepted on: 17 October 2005.
Region et Developpement---EDITIONS L HARMATTAN