Dictionary of Nomenclature of Celestial Objects

 .
 Izv. Krym. Astrofiz. Obs., 21, 229-256 (1959)

    The spectra, magnitudes and colours of O-A type stars in an area of the
    Milky Way, with the Center α = 20h16m, δ = +42 D 30'.
o<[I59] +39 NNN> (Nos 1-136), <[I59] +40 NNN> (Nos 1-209), <[I59] +41    NNN> (Nos 1-204), <[I59] +42 NNN> (Nos 1-191), <[I59] +43 NNN> (Nos    1-138), <[I59] +44 NN> (Nos 1-74)
 Auth.:IKHSANOV N.R.

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