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The observations have been done at the Observatory of Haute-Provence (CNRS), France. This article was published in English and is reprinted here as in the original.
Institut d'Astrophysique de Paris; Byurakan Astrophysical Observatory. Translated from Astrofizika, Vol. 13, No. 3, pp. 437–447, July–September, 1977.
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Chalonge, D., Divan, L. & Mirzoyan, L.V. Spectrophotometric studies of nonstable stars. III. The spectrum of FG Sagittae in 1968–1973. Astrophysics 13, 247–252 (1977). https://doi.org/10.1007/BF01001218
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DOI: https://doi.org/10.1007/BF01001218