Media type: E-Article Title: Hydrogen in optical germanium and reduction of its negative impact on the crystal properties by ultrasonic processing Contributor: Pekar, G. S.; Singaevsky, A. F.; Lokshin, M. M.; Singaevsky, A. A. imprint: Springer Science and Business Media LLC, 2018 Published in: Applied Physics A Language: English DOI: 10.1007/s00339-018-2010-x ISSN: 0947-8396; 1432-0630 Keywords: General Materials Science ; General Chemistry Origination: Footnote: