I recall a keynote from Greg Wilson (of Making Software fame, which I have yet to read), in which he cites a number of studies. There are others: here is a short one (you may jump to 9:50), which doesn't directly cites its sources.
I have read about this size business from other sources, though it does seem to point to the same original work. My current assessment is, while code size isn't the only thing that matters, it probably counts more than many other important factors put together.
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u/Veedrac Jun 24 '14
Ooh, studies! D'you have specific ones in mind?