共 32 条
[1]
[Anonymous], HARVARD OBSERVATORY
[2]
[Anonymous], 1955, ANN DASTROPHYSIQUE
[3]
DANJON A, 1928, ANN OBS STRASBOURG, V2, P138
[5]
GUNTHER O, 1955, ASTRON NACHR, V282, P271
[10]
JOHNSON HL, 1958, 90 LOW OBS B