[1] [CITE@en[X3D and HTML5 - Web3D.org]]
([TIME[2009-08-19 01:23:38 +09:00]] 版)
<http://www.web3d.org/x3d/wiki/index.php/X3D_and_HTML5>

[2] [CITE[Ming's Coding Blog: U3D vs. X3D]] <http://my2iu.blogspot.com/2005/02/u3d-vs-x3d.html>