By Kirchberg K.-D.   in Annals of Global Analysis and Geometry

ISSN:0232-704X|38|3|273-284

Springer Publishing Company ‎(2010)‎

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By Kirchberg K.-D.   in Annals of Global Analysis and Geometry

ISSN:0232-704X|17|2|97-111

Springer Publishing Company ‎(1999)‎

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By Kirchberg K.-D.   in Journal of Geometry and Physics

ISSN:0393-0440|49|1|101-115

Elsevier‎(2004)‎

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