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1981ApJ...247.1039G - Astrophys. J., 247, 1039-1051 (1981)
Proper motions and distances of H2O maser sources. II. W51 MAIN.
GENZEL R., DOWNES D., SCHNEPS M.H., REID M.J., MORAN J.M., KOGAN L.R., KOSTENKO V.I., MATVEYENKO L.I. and RONNANG B.
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Simbad objects: 2
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