Purinoceptors on blood platelets: further pharmacological and clinical evidence to suggest the presence of two ADP receptors - Gachet, C; Cattaneo, M; Ohlmann, P; hechler, B; Lecchi, A; Chevalier, J; Cassel, D; Mannucci, P M; Cazenave, J-P (Br J Haematol, 1995)