Ultra-low-background apparatus with germanium shielding Popeko, L. A. ; Lerbin, A. V. ; Chernyǐ, A. V. ; Bakhlanov, S. V. ; Muratova, V. N. ; Shishkina, G. A. ; Klapdor, H. V. Abstract Publication: Soviet Journal of Experimental and Theoretical Physics Letters Pub Date: September 1989 Bibcode: 1989JETPL..50..247P