共 12 条
[4]
COYNE GV, 1966, ASTROPHYS J, V17, P355
[5]
ELVIUS A, 1968, LOWELL OBSERV, V7, P55
[6]
HALL JS, 1958, PUBL US NAVAL OBS, V17, P275
[9]
JOHNSON HL, 1968, NEBULAE INTERSTELLAR, pCH5
[10]
Mathewson D. S., 1970, Memoirs of the Royal Astronomical Society, V74, P139