Müller, M. Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Rotter, I. Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
Heiss, W. D., Müller, M., & Rotter, I. (1998). Collectivity, phase transitions, and exceptional points in open quantum systems. Physical Review E, 58, 2894-2901.