共 44 条
[4]
BURBIDGE GR, 1968, ASTROPHYS J, V73, P890
[5]
CAMPBELL WW, 1918, LICK OB PUB, V13, P122
[6]
CAMPBELL WW, 1918, LICK OBS PUBL, V13, P88
[9]
CZYZAK SJ, 1968, IAU34 S, P138
[10]
CZYZAK SJ, 1970, PRIVATE COMMUNICATIO