El-Ganainy, Ramy Max Planck Institute for the Physics of Complex Systems, Max Planck Society;
https://www.nature.com/articles/s41467-018-07105-0 (Publisher version)
1805.07620.pdf (Preprint), 2MB
Zhong, Q., Khajavikhan, M., Christodoulides, D. N., & El-Ganainy, R. (2018). Winding around non-Hermitian singularities. Nature Communications, 9: 4808. doi:10.1038/s41467-018-07105-0.