Board Thread:Naruto Discussions/@comment-26993711-20160319001508/@comment-27327999-20160530195223

http://oi68.tinypic.com/162yz5.jpg

This databook was released at a point where Tobi wasn't revealed yet, so of course it's not going to say Kamui by name.

However it describes kamui's properties of slipping through any attack and uses Itachi's amaterasu as an example.

Pretty cut and dry to me.