[5]Singapore Status, Electronic Transactions Act

　　https://sso.agc.gov.sg/Act/ETA2010

　　[6] Zegal, Global E-signing Handbook

　　https://ts5mapnq9e48izo12znjei1n-wpengine.netdna-ssl.com/wp-content/themes/FoundationPress/ebooks/e-signatures/Zegal%20Global%20E-signing%20Handbook%20-%20Country%20by%20country%20guide.pdf

　　[7] National People‘s Congress of China, China’s Electronic Signature Law (中华人民共和国电子签名法)

　　https://www.npc.gov.cn/wxzl/wxzl/2004-10/20/content_334609.htm

　　[8] Adobe, Brexit briefing: What is the impact on electronic signature laws in the UK？

　　https://helpx.adobe.com/content/dam/help/en/sign/Brexit%20briefing%20-%20What%20is%20the%20impact%20on%20electronic%20signature%20laws%20in%20the%20UK.pdf

　　[9] Ascertia, Basics of Digital Signatures & PKI

　　https://www.signinghub.com/wp-content/uploads/2017/05/Basics-of-Digital-Signatures-and-PKI-s.pdf

　　[10] Supreme People‘s Court of China, Rules for Online Litigation in People’s Court (人民法院在线诉讼规则)

　　https://www.court.gov.cn/fabu-xiangqing-309551.html