Maounis T, Kourgiannides G, Poulos G, Vassilikos V, Manolis A, Cokkinos DV. Comparison of long-term performance of VDD pacemakers to ODD pacemakers. In: EUROPEAN HEART JOURNAL. Vol. 23. WB SAUNDERS CO LTD 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND; 2002. pp. 159–159.