共 20 条
[2]
BAADE W, 1952, AP J, V115, P288
[3]
BAADE W, 1951, PUB OBS U MICH, V10, P9
[4]
HOLMBERG E, 1952, MEDD LUNDS ASTR OB 1
[5]
HOLMBERG E, 1950, MEDD LANDS ASTR OB 2
[7]
HUBBLE E, 1936, REALM NEBULAE, P149
[8]
HUBBLE EP, 1932, AP J, V76, P112
[10]
ROSS FE, 1938, AP J, V88, P551