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Dube, T., Mandal, S., & Panda, J. J. (2017). Nanoparticles generated from a tryptophan derivative: physical characterization and anti-cancer drug delivery. Amino Acids, 49(5), 975–993. doi:10.1007/s00726-017-2403-8 
10.1007/s00726-017-2403-8