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North CS, Alpers DH, Helzer JE, Spitznagel EL, Clouse RE.North CS, et al.Ann Intern Med. 1991 Mar 1;114(5):381-6. doi: 10.7326/0003-4819-114-5-381.Ann Intern Med. 1991.PMID: 1992880
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Weaver JD, Dingman RL, Morgan J, Hong BA, North CS.Weaver JD, et al. Among authors: north cs.J Behav Health Serv Res. 2000 Aug;27(3):314-20. doi: 10.1007/BF02291742.J Behav Health Serv Res. 2000.PMID: 10932444Review.