PT Journal AU Yekani, R Rusak, E Riaz, A Felten, A Breitung, B Dehm, S Perera, D Rohrer, J Rockstuhl, C Krupke, R TI Formation of nanocrystalline graphene on germanium SO Nanoscale PY 2018 BP 12156 EP 12162 VL 10 IS 25 DI 10.1039/c8nr01261j LA english ER