By Malamud M.   Neidhardt H.   in Russian Journal of Mathematical Physics

ISSN:1061-9208|21|1|55-98

MAIK Nauka/Interperiodica‎(2014)‎

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By Ichinose T.   Neidhardt H.   Zagrebnov V.A.   in Journal of Functional Analysis

ISSN:0022-1236|207|1|33-57

Elsevier‎(2004)‎

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