Jonathan Grant, Robert Cottrell, Françoise Cluzeau, Gail Fawcett
Grant J, Cottrell R, Cluzeau F, Fawcett G.
Evaluating “payback” on biomedical research from papers cited in clinical guidelines: applied bibliometric study
BMJ 2000; 320 :1107
doi:10.1136/bmj.320.7242.1107