http://reply.papertrans.cn/3/269/26894/26894-21.png
http://reply.papertrans.cn/3/269/26894/26894-22.png
http://reply.papertrans.cn/3/269/26894/26894-23.png
http://reply.papertrans.cn/3/269/26894/26894-24.png
http://reply.papertrans.cn/3/269/26894/26894-25.png
http://reply.papertrans.cn/3/269/26894/26894-26.png
http://reply.papertrans.cn/3/269/26894/26894-27.png
Submitted on: 08 February 2001.
Revised on: 20 February 2001.
Accepted on: 16 March 2001.
Revista Digital Lampsakos---UNIV CATOLICA LUIS AMIGO
http://reply.papertrans.cn/3/269/26894/26894-29.png
http://reply.papertrans.cn/3/269/26894/26894-30.png