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Published online by Cambridge University Press: 20 June 2003
We draw attention to the following mistakes which appear in the above-mentioned paper (pp. 732–734). We are grateful to J.-F. Mattei who pointed out with an example that the notion of singular holonomy should be enlarged and consequently the Structure Theorem restated. The main result (Theorem 1) remains untouched. We refer to the same notation and terminology of the paper.