those two were anecdotes, not studies

Did you miss this (from the HBS link)?

"Employing women who are excluded by their own countries' labor markets is a growing trend for firms with international branch offices, says Harvard Business School professor Jordan Siegel. He discusses the issue in a new study titled "Multinational Firms, Labor Market Discrimination, and the Capture of Competitive Advantage by Exploiting the Social Divide", which he co-wrote with Lynn Pyun of MIT and B.Y. Cheon of Hanshin University and the Korea Labor Institute."

Edit: Oh, or did you mean that what you'd read before was just anecdotes?