TI - Vibrational Analysis and Hydrogen-Bonding Effects on the Vibrational Modes of Zwitterionic DL-Tryptophan: IR Spectroscopy and DFT Calculations AU - BOUKAOUD, A. AU - CHIBA, Y. AU - DEHBAOUI, M. AU - GUECHI, N. SO - Sigma Journal of Engineering and Natural Sciences 2019;37:1181-1198. DO -