Proton Beam Therapy for Loco-Regional Control of a Recurrent Mixed Malignant Germ Cell Tumor of the Skull in a 22-Month-Old Girl - Calaminus, G.; Göbel, U.; Schrum, J.; Wittkugel, O.; Westphal, M.; Timmermann, B. (Klinische Pädiatrie, 2010)