Interstitial doping induced superconductivity at 15.3K in `Nb IND.5´`Ge IND.3´ compound - Bortolozo, Ausdinir Danilo; Santos, Carlos Alberto Moreira dos; Jardim, Renato de Figueiredo; Ritter, C; Devishvili, A; Rotter, M; Gandra, F G; Machado, Antonio Jefferson da Silva (Journal of Applied Physics, 2012)