Paulsen, H., and Todt, K., Cyclic Monosaccharides Having Nitrogen or Sulfur

Paulsen, H., and Todt, K., Cyclic Monosaccharides Having Nitrogen or Sulfur in the Ring, 23, 115-232 Paulsen, H. See also, Heyns, K. 

Cyclic monosaccharides having nitrogen or sulfur in the ring, H. Paulsen and K. Todt, Adv. Carbohydr. Chem., 23 (1968). 

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