References

• Cowley A.P., Schmidtke P.C., Ebisawa K., et al., 1991, ApJ 381, 526 NASA ADS
• De Korte P., Bleeker J.A.M., den Boggende A.J.F., et al., 1981, Space Sci. Rev. 30, 495 NASA ADS
• Elvis M., Plummer D., Schachter J., Fabbiano G., 1992, ApJS 80, 257 NASA ADS
• Forman W., Jones C., Cominsky L., et al., 1978, ApJS 38, 357 NASA ADS
• Gottwald M., 1984, EXOSAT Express 4, 46
• Kholopov P.N., Samus N.N., Kazarovets B.V., Frolov M.S., Kireeva N.N., 1989, Inf. bull. Variable Stars 3323, 1
• Kuulkers E., 1995, PhD thesis. University of Amsterdam
• McHardy I.M., Lawrence A., Pye J.P., Pounds K.A., 1981, MNRAS 197, 865 NASA ADS
• Peacock A., Andresen R.D., Manzo G., et al., 1981, Space Sci. Rev. 30, 525
• Ritter H., 1990, A&AS 85, 1179 NASA ADS
• Turner M.J.L., Smith A., Zimmermann H.U., 1981, Space Sci. Rev. 30, 512 NASA ADS
• Van Paradijs, J., 1995, A catalog of X-ray binaries. In: Lewin W.H.G., van Paradijs J., van den Heuvel E.P.J. (eds.). Cambridge Astrophysics Ser. 26, p. 536
• Veron-Cetty M.P., Veron P., 1996, ESO Scientific Report 17
• Voges W., Aschenbach B., Boller Th., et al., 1996, IAU Circ. 6420
• Voges W., Aschenbach B., Boller Th., et al., 1998, A&AS (in preparation)
• Warwick R.S., Turner M.J.L., Watson M.G., Willingale R., 1985, Nat 317, 21
• Warwick R.S., Norton A.J., Turner M.J.L., Watson M.G., Willingale R., 1988, MNRAS 232, 551 NASA ADS
• Warwick R.S., Marshall N., Fraser G.W., et al., 1981, MNRAS 197, 893 NASA ADS
• White N.E., Peacock A., 1988, Mem. della Società Astr. Ital. 59, 7 NASA ADS
• Wood K.S., Meekins J.F., Yentis D.J., et al., 1984, ApJS 56, 507 NASA ADS