· ED & J. Duffus (Eds.) compendium of beet diseases and insects. Aps press. 13- Steudel, W....
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· ED & J. Duffus (Eds.) compendium of beet diseases and insects. Aps press. 13- Steudel, W. and R. Thielman. 1970. Weitere untersuchungen Zur Frage der Empfindlichkeit von Zuckerrubengegen