共 25 条
[5]
GOLDBERG L, 1960, AP J SUPPL, V5, P1
[7]
HABING HJ, 1969, B ASTRON I NETH, V20, P177
[8]
HERBIG GH, 1968, Z ASTROPHYS, V68, P243
[9]
HJELLMING RM, 1969, ASTRON ASTROPHYS, V2, P202