เฮกเซน

http://th.wikipedia.org/wiki/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%97%E0%B8%B3%E0%B8%A5%E0%B8%B0%E0%B8%A5%E0%B8%B2%E0%B8%A2


http://www.chemtrack.org/News-Detail.asp?TID=1&ID=92


http://www.npc-se.co.th/news_safety/npcse_01safety.asp?news_id=1542