共 23 条
[13]
Mayall N. U., 1960, ANN ASTROPHYS, V23, P344
[14]
MORGAN WW, 1959, SCIENCE, V130, P1421
[15]
ROGSTAD DH, 1971, ASTRON ASTROPHYS, V13, P99
[18]
SHOSTAK GS, 1971, THESIS CALIFORNIA I