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Bot. Gaz., 62 : 425-465, 1916. 

 RiiGGEBERQ, H.. Beitrage zur Anatomie der Zuckerriibe. Mitt. Kaiser 



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Bull. 104: 1-12, 1914. 

 TowNSEND, C. O., and Rittue, E. C: The Development of Single-germ Beet 



Seed. U. S. Dept. Agr. Bur. Plant Ind. Bull. 73: 1-23, 1905. 

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