References

• Bocchino F., Maggio A., Sciortino S., 1994, ApJ 437, 209 NASA ADS
• Damiani F., Maggio A., Micela G., Sciortino S., 1997a, ApJ 483, 350 NASA ADS
• Damiani F., Maggio A., Micela G., Sciortino S., 1997b, ApJ 483, 370 NASA ADS
• David L.P., Harnden Jr.F.R., Kearns K.E., Zombeck M.V., 1995, "The ROSAT High Resolution Imager (HRI), US. ROSAT Science Data Center/SAO"
• Harnden F.R.Jr., Fabricant D.G., Harris D.E., Schwarz J., 1984, SAO Special Report 393
• Hasinger G., Boese G., Predehl P., et al., 1993, MPE/OGIP Calibration Memo, CAL/ROS/93-015
• Kashyap V., Micela G., Sciortino S., Harnden F.R.Jr., Rosner R., 1994, in "The Soft X-ray Cosmos", Schlegel E.M. (ed.) AIP Conf. Proc. 313, 239
• Mackie G., Fabbiano G., Barbera M., et al., 1996, in proceeding of the Astronomical Data Analysis Software and Systems V, ASP Conf. Ser. (in press)
• Pfeffermann E., Briel U.G., 1986, SPIE 597, 208
• Snowden S.L., Freyberg M.J., 1993, ApJ 404, 403 NASA ADS
• Snowden S.L., Plucinsky P.P., Briel U., Hasinger G., Pfefferman E., 1992, ApJ 393, 819 NASA ADS