共 16 条
[2]
FABBIANO AG, 1979, ASTROPHYS J, V230, pL67
[4]
MATTHEWS WG, 1978, ASTROPHYS J, V219, P413
[5]
OEMLER A, 1976, ASTROPHYS J, V194, P1
[9]
SCHREIER EJ, 1979, HEAO SCI S, P390
[10]
SPINRAD H, 1980, IAU S, V92, P39