Feasibility of interstitial stepping-source electronic brachytherapy to locally inoperable tumors - Ruder, Arne Mathias; Inghelram, Laurens; Schneider, Frank; Sarria, Gustavo; Hesser, Jürgen; Bludau, Frederic; Obertacke, Udo; Wenz, Frederik; Abo-Madyan, Yasser; Giordano, Frank (Journal of Contemporary Brachytherapy, 2020)