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Author and editors are highly indebted to the referee for his unfailing and repeated prodding to remove mistakes and obscurities as well as for his constructive suggestions.
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Varsos, D. The automorphism group of certain HNN extensions. Arch. Math 50, 402–416 (1988). https://doi.org/10.1007/BF01196500
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DOI: https://doi.org/10.1007/BF01196500