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Bergfeld, Anne K., Roger Lawrence, Sandra L. Diaz, Oliver M. T. Pearce, Darius Ghaderi, Pascal Gagneux, Meave G. Leakey, ja Ajit Varki. "N-glycolyl Groups of Nonhuman Chondroitin Sulfates Survive in Ancient Fossils." Proc Natl Acad Sci U S A 2017.

Bergfeld, Anne K., et al. "N-glycolyl Groups of Nonhuman Chondroitin Sulfates Survive in Ancient Fossils." Proc Natl Acad Sci U S A 2017.