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Photometric and spectroscopic observations of the BL Lacertae object AO 0235+164

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RIEKE, G., GRASDALEN, G., KINMAN, T. et al. Photometric and spectroscopic observations of the BL Lacertae object AO 0235+164. Nature 260, 754–759 (1976). https://doi.org/10.1038/260754a0

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