Comparison of low-molecular-weight heparin wifli unfractionated heparin acutely and with placebo for 6 weeks in the management of unstable coronary artery disease. Fragmin in Unstable Coronary Artery Disease Study (FRIC) - Klein, W; Buchwald, A; Hillis, SE; Monrad, S; Sanz, G; Turpie, AGG; Van der Meer, J; Olafson, E; Undenland, S; Ludwig, K; for the FRIC investigators (Circulation, 1997)