Submitted on: 15 February 2000.
Revised on: 26 May 2000.
Accepted on: 23 June 2000.
___________________Documents d Analisi Geografica
Submitted on: 11 April 2015.
Revised on: 11 June 2015.
Accepted on: 16 July 2015.
___________________Documents d Analisi Geografica
http://reply.papertrans.cn/1/77/7613/7613-23.png
Submitted on: 19 March 2010.
Revised on: 03 June 2010.
Accepted on: 31 July 2010.
___________________Documents d Analisi Geografica
http://reply.papertrans.cn/1/77/7613/7613-25.png
Submitted on: 04 February 1999.
Revised on: 21 May 1999.
Accepted on: 12 June 1999.
___________________Documents d Analisi Geografica
http://reply.papertrans.cn/1/77/7613/7613-27.png
http://reply.papertrans.cn/1/77/7613/7613-28.png
Submitted on: 08 September 2014.
Revised on: 29 November 2014.
Accepted on: 31 December 2014.
___________________Documents d Analisi Geografica
http://reply.papertrans.cn/1/77/7613/7613-30.png