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[2]
KIPPENHAHN R, 1955, ASTRON NACHR, V282, P74
[3]
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[4]
MERRILL JE, 1950, 23 CONTR PRINC U OBS
[5]
QUESTER W, 1961, 10 BAV RUNDBR
[6]
RUSSELL HN, 1952, 26 CONTR PRINC U OBS