Comparison of low-molecular-weight heparin with unfractionated heparin acutely and with placebo for 6 weeks in the management of unstable coronary disease - Klein, W; Buchwald, A; Hillis, SE; Monrad, S; Sanz, G; Turpie, GG; van der Meer, J; Olaisson, E; Undeland, S; Ludwig, K; for the FRIC Investigators (Circulation, 1997)