R. Mehta, E. Peterson, и R. Califf. The American Journal of Medicine, 120 (5):
398-402(мая 2007)PUBM: Print; GR: HS010548/HS/AHCPR; JID: 0267200; RF: 39; 2006/07/18 received; 2006/12/08 revised; 2006/12/27 accepted; ppublish.
S. French, S. McDonald, J. McKenzie, и S. Green. BMC medical research methodology, (октября 2005)LR: 20061115; PUBM: Electronic; DEP: 20051014; JID: 100968545; 2005/08/05 received; 2005/10/14 accepted; 2005/10/14 aheadofprint; epublish.
G. Browman. JAMA : the journal of the American Medical Association, 286 (12):
1509-1511(сентября 2001)LR: 20061107; PUBM: Print; JID: 7501160; CON: JAMA. 2001 Sep 26;286(12):1461-7. PMID: 11572738; ppublish.