Michels, Franziska, Claudia Schilling, Franziska Rausch, Sarah Eifler, Mathias Zink, Andreas Meyer-Lindenberg, and Michael Schredl. “Nightmare Frequency in Schizophrenic Patients, Healthy Relatives of Schizophrenic Patients, Patients at High Risk States for Psychosis, and Healthy Controls”. International Journal of Dream Research 7, no. 1 (April 28, 2014): 9–13. Accessed March 28, 2024. https://journals.ub.uni-heidelberg.de/index.php/IJoDR/article/view/11819.