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Wiersig, Jan. (2020). Robustness of exceptional-point-based sensors against parametric noise: The role of Hamiltonian and Liouvillian degeneracies. Physical Review A, 101(5), 053846–. doi:10.1103/PhysRevA.101.053846 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research