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Additional information
Institute of Space Research, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 16, No. 5, pp. 799–802, May, 1973.
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Burke, B.F., Johnston, K.D., Efanov, V.A. et al. Observations of sources of maser radio emission having an angular resolution of 0.2 msec of arc. Radiophys Quantum Electron 16, 613–616 (1973). https://doi.org/10.1007/BF01033503
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DOI: https://doi.org/10.1007/BF01033503