MA, L., ZHAO, D.-X., REN, H.-P., LU, K., & ZHAO, Y.-F. (2010). Synthesis and Separation of L-Trytophan Oligo-Peptides Assisted by Phosphorus Oxychloride. Asian Journal of Chemistry, 22(6), 4393–4397. Retrieved from https://asianpubs.org/index.php/ajchem/article/view/16749