Clopidogrel – a platelet inhibitor which inhibits thrombo-genesis in non-anticoagulated human blood independently of the blood flow conditions - Roald, H E; Barstad, R M; Kierulf, P; SkjØrten, F; Dickinson, J P; Kieffer, G; Sakariassen, K S (Thromb Haemost, 1994)