Shear- induced platelet aggregation can be mediated by vWb released from platelets, as well as by exogenous large or unusually large vWF multimeres, requires adenosine diphosphate, and is resistant to aspirin - Moake, J L; Turner, N A; Stehopolous, N A; Nolasco, L H; Heliums, J D (Blood, 1981)