共 13 条
[3]
ARGUE AN, 1969, OBSERVATORY, V89, P115
[5]
BARBIERI C, 1971, 245 CONTR OBS ASTR A
[6]
DIECKVOSS W, 1967, T INT ASTR UNION B, V13, P61
[9]
MURRAY CA, 1971, 162 R OBS B
[10]
REDMAN RO, 1953, OBSERVATORY, V73, P180