Phase I study – clopidogrel – a human platelet inhibitor which inhibits thrombogenesis in human non-anticoagulated blood independently of the blood flow conditions (Abstract) - Roald, H E; Barstad, R M; Kicrulf, P; Skjorten, F; Dickinson, J P; Sakariassøn, K S (Thromb Haemost, 1993)