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Questions answered by I.Z.Eifer, Ma.Techn.Sci. director of the laboratory of processes and apparatus of the All-Union Scientific-Research Institute for Man-Made Fibres. Fibre Chem 7, 338–339 (1976). https://doi.org/10.1007/BF00543153
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DOI: https://doi.org/10.1007/BF00543153