Fritzsche, L., Fritzsche, M. and Majoe, D. 2016. Optimi (Online Predicative Tools For Intervention In Mental Illness). Biofeedback Based On Heart Rate Variability As A Preventive Tool Against Stress-Related Disorders. Psychiatry, Neurology and Medical Psychology. 2, 2 (4) (Aug. 2016), 48–52.