Zettl, R., Feldwisch, J., Boland, W., Schell, J., & Palme, K. (1992). 5'-Azido-[3,6-3H2]-1-napthylphthalamic
acid, a photoactivatable probe for naphthylphthalamic acid receptor proteins from higher plants: identification of a 23-kDa
protein from maize coleoptile plasma membranes. Proceedings of the National Academy of Sciences of
the United States of America, 89(2), 480-484. doi:10.1073/pnas.89.2.480.