This is what I'm referring to:

> A lot will be from before 2000, before we had things like "Agile" and "unit tests" and "widespread version control", so you can't extrapolate any of their conclusions to what we're doing. As a rule of thumb I try to keep to papers after 2010.

While I admit that even in the late 90s, it seemed strange to me to see citations from the 70s or 80s about projects from the 60s (like, say, OS/360), I'm not convinced that so much has changed in the last ten to twenty years as to render all previous research irrelevant.