大佬文章总结很棒
http://byd.dropsec.xyz/2018/07/12/%E5%AD%90%E5%9F%9F%E5%90%8D%E5%8A%AB%E6%8C%81%EF%BC%88Subdomain-takeover%EF%BC%89/
TimeS0ng大佬翻译的文章
https://times0ng.github.io/2019/03/29/%E7%AC%AC%E4%BA%8C%E5%8D%81%E4%BA%8C%E7%AF%87%EF%BC%9A%E5%AD%90%E5%9F%9F%E5%90%8D%E5%8A%AB%E6%8C%81/
https://medium.com/bugbountywriteup/taking-over-google-calendar-of-a-company-1c49071f6a9