共 18 条
[1]
BADE W, 1951, PUB OBS U MICHIGAN, V10, P13
[2]
HOFFLEIT D, 1939, HARVARD B, V911
[3]
HUBBLE E, 1938, PUB ASP, V50, P108
[4]
HUBBLE E, 1929, AP J, V69, P145
[7]
MCLAUGHLIN DB, 1944, POP ASTR, V52, P115
[8]
MCLAUGHLIN DB, 1948, POP ASTR, V56, P467
[9]
MCLAUGHLIN DB, 1939, POP ASTR, V47, P416
[10]
MCLAUGHLIN DB, 1945, PUB ASP, V57, P73