à¸§à¸´à¸—à¸¢à¸²à¸¨à¸²à¸ªà¸•à¸£à¹Œà¹à¸¥à¸°à¹€à¸—à¸„à¹‚à¸™à¹‚à¸¥à¸¢à¸µ, à. 2014 Dec 15. à¸›à¸à¸«à¸™à¹‰à¸². Naresuan University Journal: Science and Technology (NUJST). [Online] 22:2