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2. Barthelmes, D. - 1960 - Erprobung eines Krautgreifers. Z. Fischerei 9: 457–463.
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4. But, V. I. - 1938 - Kolicestvennaja draga dla issledovanija bentosa zarosley v vodoemach. Doklady Akad. Nauk SSSR 14. (Not seen, as reviewed by Kajak, 1971).
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