1208.2883 (Alexander L. Burin et al.)

Low temperature dipolar echo in amorphous dielectrics: Significance of
relaxation and decoherence free two level systems
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Alexander L. Burin, John M. Leveritt III, Gudrun Fickenscher, Andreas Fleischmann, Christian Schötz, Mesoomeh Bazrafshan, Paul Faßl, Manfred v. Schickfus, Christian Enss