1. Pearson SD, Moreno R, Trnka Y. Informal consultations provided to general internists by the gastroenterology department of an HMO. J Gen Intern Med. 1998;13:435–8.
2. Nutting PA, Franks P, Clancy CM. Referral and consultation in primary care: do we understand what we’re doing? J Fam Pract. 1992;35:21–3.
3. Forrest CB, Reid RJ. Passing the baton: HMOs influence on referals to specialty care. Health Aff. 1997;16:157–62.
4. Franks P, Clancy CM. Referrals of adult patients from primary care: demographic disparities and their relationship to HMO insurance. J Fam Pract. 1997;45:47–53.
5. Bourguet C, Gilchrist V, McCord G. The consultation and referral process. J Fam Pract. 1998;46:47–53.