1)Brignole M, Auricchio A, Baron-Esquivias G, et al:2013 ESC Guidelines on cardiac pacing and cardiac resynchronization therapy: the Task Force on cardiac pacing and resynchronization therapy of the European Society of Cardiology (ESC). Developed in collaboration with the European Heart Rhythm Association (EHRA). Eur Heart J 34:2281-2329,2013
2)Narula OS:Current concepts of atrioventricular block. In: His bundle electrocardiography and clinical electrophysiology (Narura OS, ed), FA Davis, Philadelphia,p146,1975
3)Narula OS, Samet P:Wenckebach and Mobitz type II A-V block due to block within the His bundle and bundle branches. Circulation 41:947-965,1970