Oktaviani, N. M. D., I. D. Larasati, A. W. Nugroho, W. Setyaningsih, and M. Palma. “Ultrasound-Assisted Extraction of L-Tryptophan from Chamomile Flower: Method Development and Application for Flower Parts Characterization and Varietal Difference”. Trends in Sciences, vol. 21, no. 3, Jan. 2024, p. 7348, doi:10.48048/tis.2024.7348.