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Dedicated to Professor Dr. Dr. C.Hallauer on the occasion of his 70th birthday.
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Bergold, G.H., Mazzali, R. Problems using density gradients. Archiv f Virusforschung 31, 168–174 (1970). https://doi.org/10.1007/BF01241674
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DOI: https://doi.org/10.1007/BF01241674