共 18 条
[1]
ADE P, 1969, OBSERVATORY, V90, P6
[3]
BEARD M, 1966, AUST J PHYS, V19, P875
[7]
JOHNSON HL, 1968, NEBULAE INTERSTELLAR, P193
[9]
Osterbrock D. E, 1974, ASTROPHYSICS GASEOUS