There is none I'm aware of, but there are some quotes though :) I think we have justified text because of historic reason, it doesn't make much use on the web since it's a totally new medium.

> Are you saying that you can't be sure how it looks and therefore you can't justify it?

No, I'm saying it's unpredictable so we should avoid using it, while left aligned text is the default that works best in any circumstance.