Percutaneous treatment of small hepatic tumors by an expandable RF needle electrode. - Rossi,S.; Buscarini,E.; Garbagnati,F.; Di Stasi,M.; Quaretti,P.; Rago,M.; Zangrandi,A.; Andreola,S.; Silverman,D.; Buscarini,L. (Am J Roentgenol, 1998)