Immunological differentiation of classical hemophilia (factor VIII deficiency) and von Willebrand's disease with observations on combined deficiencies of antihemophilic factor and proaccelerin (factor V) and an acquired anticoagulant against antihemophilic factor - Zimmerman,T.S.; Ratnoff,O.D.; Powell,A.E. (J Clin Invest, 1971)