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1981ApJ...243..681U - Astrophys. J., 243, 681-689 (1981)
A survey of rich clusters of galaxies with HEAO 1. II.
ULMER M.P., KOWALSKI M.P., CRUDDACE R.G., JOHNSON M., MEEKINS J., SMATHERS H., YENTIS D., WOOD K., McNUTT D., CHUBB T., BYRAM E.T. and FRIEDMAN H.
Journal keyword(s):
Simbad objects: 37
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