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" ¼Å¡ÒÃÇÔ¨ÑÂÂѧÊÃØ»ä´éäÁèªÑ´à¨¹¹Ñ¡ áµè¼Å»ÃÐ⪹ì¢Í§Ë¹Í¹¼ÕàÊ×éÍàËç¹ä´éÍÂèÒ§ªÑ´à¨¹ áµèàÃÒäÁèÃÙéÇèҼŻÃÐ⪹ì¢Í§½Ù§Á´ ¨ÐÍÂÙèã¹ÃдѺµèÓÊØ´ËÃ×ÍäÁè µÒÁ¼Å¡ÒÃÇԨѢͧ·ÕÁ¼ÙéÇԨѪش¹Õé áµè¶éҢͧàËÅÇãËéÊÒÃÍÒËÒ÷Õè¾Íà¾Õ§¡Ñº½Ù§Á´ Áѹ¡ç´ÙàËÁ×͹ÇèÒÀÒ¾ÃÇÁ·Ñé§ËÁ´¤×Í ÁÕ¤ÇÒÁÊÁ´ØÅã¹àªÔ§ºÇ¡¡Ñº½Ù§Á´´éÇÂàªè¹¡Ñ¹ " Martin Heil ¨Ò¡ Center for Research and Advanced Studies of the National Polytechnic Institute in Irapuato ·Õè Mexico ä´éÊÃØ»¤ÇÒÁàËç¹à¾ÔèÁàµÔÁ
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