NegusDPintoDJSlackWW. The effect of small doses of heparin on platelet adhesiveness and lipoprotein-lipase activity before and after surgery. Lancet1971; 1: 1202.
2.
NegusDFriedgoodACoxSJPeelALGWellsBW. Ultra-low dose intravenous heparin in the prevention of postoperative deep vein thrombosis. Lancet1980; 1: 891–4.
3.
NegusDFriedgoodA. Further studies on micro-dose intravenous heparin. Phlebology1987; 2: 257–63.