question for the geeks

I'm almost certain I've seen this somewhere, but now I can't recall and I can't seem to google it without getting a bazillion hits on stuff I don't want. I thought there was a study or white paper on women, tech, and performance bonuses -- something about how when companies set up a bonus system based on "value" (not just flat-breaks into percentages) it's minorities and women who always end penalized in some way. This makes sense; what isn't valued doesn't get marked as valuable enough to warrant an equal share of the bonus pie. But I can't find the study or white paper, or even a reference to it.

Does this ring a bell for anyone?