[parsimo2010]

The title doesn't and can't contain all the nuance of the article. Considering that books were published about data analysis in Clojure, the bar to clear for market size isn't that high. A lot of people buy books for reference even when you could learn everything online.

[dunefox]

They might have been published, but how successful are they? I have no idea, but it's very realistic that one publisher is more risk averse while another isn't. This doesn't say anything about the language, really.