1. X-Ray Astronomy '84, International Symp. on X-Ray Astronomy;Jones,1984
2. 23rd ESLAB Symp. on Two Topics in X-Ray Astronomy: 2. AGN and the X-Ray Background;Koyama,1988
3. 23rd ESLAB Symp. on Two Topics in X-Ray Astronomy: 2. AGN and the X-Ray Background;Turner,1988
4. A new X-ray spectral observation of NGC 1068