Percutanous and Intraoperative Ultrasound-Guided Radiofrequency Ablation of Hepatic Tumours - Stang, A; Keles, H; von Seydewitz, C; Hentschke, S; Malzfeldt, E; Teichmann, W; Braumann, D (Ultraschall in der Medizin - European Journal of Ultrasound, 2007)