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HERBIG, 1946, PUB ASP, V58, P163
[2]
HUBBLE EP, 1922, AP J, V56, P181
[3]
HUBBLE EP, MT W CONTR, V241
[4]
JOY, 1949, PUB ASP, V61, P133
[5]
Joy A. H., 1946, PASP, V58, P244
[7]
JOY AH, MT W CONTR, V709
[8]
MORGAN, 1946, AP J, V103, P249
[9]
STRUVE, 1948, ASTRON J, V54, P51
[10]
STRUVE, 1948, PUB ASP, V60, P61