Oktaviani, N. M. D.; Larasati, I. D.; Nugroho, A. W.; Setyaningsih, W.; Palma, M. Ultrasound-Assisted Extraction of L-Tryptophan from Chamomile Flower: Method Development and Application for Flower Parts Characterization and Varietal Difference. Trends Sci 2024, 21, 7348.