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This unpublished paper is a copy (completed by a development of section 5 andby minor corrections) of the article with the same title published in: ComplexAnalysis and Digital Geometry, Proceedings from the Kiselmanfest, 2006, ActaUniversitatis Upsaliensis, C. Organisation och Historia,86, Uppsala UniversityLibrary (2009), 147-157.

About the characterization of some residue currents