A Possible ∼20 yr Periodicity in Long-term Optical Photometric and Spectral Variations of the Nearby Radio-quiet Active Galactic Nucleus Ark 120

Yan Rong Li, Jian Min Wang, Zhi Xiang Zhang, Kai Wang, Ying Ke Huang, Kai Xing Lu, Chen Hu, Pu Du, Edi Bon, Luis C. Ho, Jin Ming Bai, Wei Hao Bian, Ye Fei Yuan, Hartmut Winkler, Eduard K. Denissyuk, Rashit R. Valiullin, Nataša Bon, Luka C. Popović

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Physics

Earth and Planetary Sciences