Board Thread:Fourth Databook/@comment-4366149-20141122004623/@comment-17623-20141201153346

NoJutsu wrote: Sorry, but there are no references in the manga or databook that can directly support it (at least, that I know of). If you know of any references, feel free to share them.

I would consider Naruto's Rasenshuriken to be the proof but people tend to disagree.