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• 1.http://forum.datatan.net/index.php/topic,html
• 2.http:// nfe_webkm/display_directory_view.php?direct=direct&&search=%C D BB%E BA%BA%E B A
E B E C C D CA%D CCA%B E B C &&enc_id=
• 3.http://neung.kaengkhoi.ac.th/information1/techno_3_2.html