共 14 条
[1]
BAILEY SI, 1921, B HARVARD COLL OBS
[2]
BERTOLA F, 1963, CONTRIB ASIAGO OBS
[3]
CANNON AJ, 1916, ANN HARVARD COLL OBS, V76, P37
[4]
CANNON AJ, 1916, ANN HARVARD COLL OBS, V76, P42
[9]
Hiltner W. A., 1956, ASTROPHYS J SUPPL S, V2, P389