Shear-induced platelet aggregation can be mediated by VWF released from platelets, as well as by exogenous large or unusually large VWF-multimcrs, requires adenosine diphosphate, and resistant to aspirin - Moake, J L; Turner, N A; Stathopoulos, N A; Nolasco, L; Heliums, J D (Blood, 1988)