1. Leonhardt, U. Optical conforming mapping. Science 312, 1777–1780 (2006).
2. Tyson, R. K. Principles of Adaptive Optics 3rd edn CRC Press (2001).
3. Mosk, A.P., Lagendijk, A., Lerosey, G. & Fink, M. Controlling waves in space and time for imaging and focusing in complex media. Nat. Phys. 6, 283–292 (2012).
4. Moiseyev, N. Non-Hermitian Quantum Mechanics Cambridge Univ. (2011).
5. Bender, C. M. Making sense of non-Hermitian Hamiltonians. Rep. Prog. Phys. 70, 947–1018 (2007).