Bredemann, G., Schwanitz, F., & Sengbusch, R. v. (1957). Aufgaben und Möglichkeiten der modernen Hanfzüchtung mit besonderer Berücksichtigung des Problems der Züchtung haschischarmer oder -freier Hanfsorten. Technical Bulletin, (4), 1-15. [pubman] 

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