Three years experience with monopolar and bipolar radiofrequency ablation surgery in patients with permanent atrial fibrillation. - Geidel,S.; Ostermeyer,J.; Lass,M.; Betzold,M.; Duong,A.; Jensen,F.; Boczor,S.; Kuck,K.H. (Eur J Cardiothorac Surg, 2005)