Demonstration of blocking immunoglobulin G, having a heterogenous behaviour, in sera of patients with Graves’ disease: Possible coexistence of different autoantibodies directed to the TSH Receptor. - Macchia,E.; Concetti,R.; Carone,G.; Borgoni,F.; Fenzi,G.F.; Pinchera,A. (Clin Endocrinol, 1988)