Rubenstein E.; T. McLaughlin; R.C. Winant; A. Sanchez; M. Eckart; K.M. Krasinska; A. Chien. Azetidine-2-carboxylic Acid in the Food Chain. Phytochemistry. 2008, 70 (1): 1–5. PMID 19101705. doi:10.1016/j.phytochem.2008.11.007.
Rubenstein E.; T. McLaughlin; R.C. Winant; A. Sanchez; M. Eckart; K.M. Krasinska; A. Chien. Azetidine-2-carboxylic Acid in the Food Chain. Phytochemistry. 2008, 70 (1): 1–5. PMID 19101705. doi:10.1016/j.phytochem.2008.11.007.