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Photographic observations obtained in Pulkovo and USNO for four visual double stars (ADS 48, 7251, 11632, 12815) have been investigated.
Kisselev, A.A. et al. (1988) The catalogue of relative positions and motions for 200 visual double stars observed with 26-inch refractor at Pulkovo in 1960–1986. Nauka, Leningrad.Google Scholar
Josties, F.J. et al. (1969-78) Photographic Measures of Double Stars. Publ. Naval Obs. vol. no. 18, 22, 24, pp. 7–104, 7–88, 7–63.Google Scholar