PT Journal AU Čížek, J Procházka, I Kužel, R Bečvář, F Cieslar, M Brauer, G Anwand, W Kirchheim, R Pundt, A TI Hydrogen-Induced Defects in Niobium Studied by Positron Annihilation SO Materials science forum PY 2004 BP 60 EP 62 VL 445-446 DI 10.4028/www.scientific.net/MSF.445-446.60 LA english ER