Standard heparin but not LMW heparin induces a concomitant increase of t-PA and PAI-1 without modification of global fibrinolysis: study after 60 days treatment - Vergnes, C; Manciet, G; Bourdenx, V; Roudaut, M F; Lacombe, F; Boisseau, M R (Thromb Res, 1991)