Abstract
The radio source 0957 + 561 has at least four components. Two coincide with the optical QSOs, which is in accordance with the hypothesis that the QSOs are images of a single object due to a gravitational lens. There are details of spectra and structure which are more difficult to reconcile with the hypothesis.
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Pooley, G., Browne, I., Daintree, E. et al. Radio studies of the double QSO, 0957 + 561A, B. Nature 280, 461–464 (1979). https://doi.org/10.1038/280461a0
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DOI: https://doi.org/10.1038/280461a0
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