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3. Unusual forms of second degree atrioventricular block, including Mobitz type II block, associated with the Morgagni-Adams-Stokes syndrome;Donoso, E.; Adler, L.N.; Friedberg, C.K.;American Heart J'ournal,1964
4. Sino-atrial heart block with Wenckebach phenomenon;American Journal of Cardiology
5. Katz, L. N., and Pick, A. (1956). Clinical Electrocardiography. Part I. The Arrhythmias. Lea and Febiger, Philadelphia.