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4. Payne, J.M., Jewell, P.R.: The upgrade of the NRAO 8-beam receiver. In: Emerson, D.T., Payne, J.M. (eds.) Multi-feed systems for radio telescopes. ASP Conferences Series, vol. 75, p. 144 (1955)
5. Johansson, J.F.: SISYFOS—a project presentation and progress report. Ibid. p. 130