Chen, C. & Wang, Z. & Saito, M. & Tohei, T. & Takano, Y. & Ikuhara, Y. (2014)
Fluorine in Shark Teeth: Its Direct Atomic-Resolution Imaging and Strengthening Function.
Angewandte Chemie International Edition, 53(6), 1543–1547 DOI: 10.1002/anie.201307689