Conditions for global non-existence and
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V.A. Galaktionov
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Article
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1983
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Elsevier Science
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The proofs of Theorems 2 and 3 are very laborious and must be omitted. We merely mention that the proof of Theorem 2 is based on the definition of regular mapping, while the proof of Theorem 3 is based on Lemmas 6,7,17,18,and 19.