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1978ApJ...223..740P - Astrophys. J., 223, 740-746 (1978)
Neutral hydrogen absorption in the spectra of quasi-stellar objects: a search for absorption due to clusters of galaxies.
PETERSON B.M.
Journal keyword(s):
Nomenclature: Table 1: [P78] ACO NNNN A, N=30
Simbad objects: 63
