Diane P. Martin

Effect of a gatekeeper plan on health services use and charges: a randomized trial.

P. Diehr, D. Martin, W. Richardson, 1989, American journal of public health.

Primary care physician compensation method in medical groups: does it influence the use and cost of health services for enrollees in managed care organizations?

B Zierler, A Cheadle, E B Perrin, 1998, JAMA.