The referenced paper [Optica 6, 944 (2019) [CrossRef]  ] has been retracted by the authors.

© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

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  1. H. Tang, Y. Yu, and X. Zhang, “Widely tunable optoelectronic oscillator based on selective parity-time-symmetry breaking,” Optica 6, 944–950 (2019).

2019 (1)

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