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3. Über die durch chromosomale Aberrationen verursachte Sterilität;Dennhöfer;Theoret. Appl. Genet.,1974
4. An attempt to correlate phytochemical data with morphological data regarding the subdivision of Heracleum sphondylium L. s. lat. and the characterization of the hybrid H. sphondylium L. ssp. sphondylium × H. mantegazzianum;Fischer;Somm. & Le.-Planta Medico,1978