Bell, Ashlie N., Donald Moss, and Robert J. Kallmeyer. “Healing the Neurophysiological Roots of Trauma: A Controlled Study Examining LORETA Z-Score Neurofeedback and HRV Biofeedback for Chronic PTSD”. NeuroRegulation 6, no. 2 (June 26, 2019): 54. Accessed May 2, 2026. https://www.neuroregulation.org/article/view/19303.