I'm also doing a little research about that.
There is no such a list that shows all those universities.
However, I believe it is possible to recognize those universities by checking their admission criterias for MBA programs. Am I right?
Unfortunately, no. Admission criteria for MBA and PhD program are not that similar. The components look the same (e.g. gmat, gpa, recommendations, essays) but the substances are quite different (e.g. type of recommenders, focus of essays, etc.).
There are a few sources of ranking for PhD. One is by UT Dallas, based on faculty's publications http://citm.utdallas.edu/utdrankings/Ra ... tatic.aspx