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2. American Journal of Cardiology, 8, 448-452.
3. Possible intranodal block;Bay, E.B.; Adams, W.,1932
4. A report of cases;American Heart Journal
5. Wenckebach phenomenon within the atria;Castellanos, A.; Iyengar, R.; Agha, A.S.; Castillo, C.A.;British Heart Journal,1972