共 44 条
[2]
ALLER LH, 1968, NEBULAE INTERSTELLAR, P483
[5]
Blaauw A., 1952, B ASTRON I NETHERLAN, V11, P405
[7]
BORGMAN J, 1964, B ASTRON I NETH, V17, P358
[8]
COURTES G, 1960, ANN AP, V23, P118
[9]
Courtes G., 1966, J OBS, V49, P329
[10]
CRAWFORD DL, IAU38 S