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To that end, we express this line bundle as a G-equivariant associated bundle of the principal H-bundle G over G/H. We also study the fibre integration of Berezinians on oriented fibre bundles. As an application, we prove a formula of `Fubini' type: the invariant integral over G can be expressed (up to sign) by a succesive invariant integration over H and G/H. 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