1. 1)https://circabc.europa.eu/sd/a/eda9d68b-6ac9-4fb9-8667-5e561d8c957e/RoHS-Pack_9_Final_Full_report_Lamps_Alloys_Solders_June2016.pdf
2. 2)http://ec.europa.eu/consumers/consumers_safety/safety_products/rapex/alerts/main/?event=main.listNotifications
3. 3)http://www.miit.gov.cn/n1146295/n1652858/n1653018/c4777618/part/4777622.pdf
4. 4)http://www.moef.gov.in/sites/default/files/EWM%20Rules%202016%20english%2023.03.2016.pdf
5. 5)http://www.meti.go.jp/meti_lib/report/2012fy/E002175.pdf