Mohan, S., N. Puviarasan, and S. Bakkialakshmi. “Vibrational Spectra and Analysis of Tryptophan”. Asian Journal of Chemistry 11, no. 4 (March 30, 2010): 1137–1143. Accessed October 3, 2024. https://asianpubs.org/index.php/ajchem/article/view/23460.