The effects of high plasma antithrombin III levels in the presence and absence of heparin on the bleeding tendency using an experimental model in rats. Observations on a novel natural heparinoid (Org 10172) - Buller, H R; Hobbelen, P M J; Princen, A W N; Moelker, H C T; Ten Cate, J W (Thromb Res, 1983)