1. Maeder,A. Stellar yields as a function of initial metallicity and mass limit for black-hole formation. Astron. Astrophys. 264, 105–120 (1992).
2. Brown,G. E., Lee, C.-H. & Bethe,H. A. Evolution of black holes in the galaxy. New Astron. (in the press).
3. Orosz,J. A. & Bailyn,C. D. Optical observations of GRO J1655-40 in quiescence. I. A precise mass for the black hole primary. Astrophys. J. 477, 876–896 (1997).
4. van der Hooft,F., Heemskerk,M. H. M., Alberts,F. & van Paradijs,J. The quiescence optical light curve of Nova Scorpii 1994 (= GRO J1655-40). Astron. Astrophys. 329, 538–550 (1998).
5. Shahbaz,T., van der Hooft,F., Casares,J., Charles,P. A. & van Paradijs,J. The mass of X-ray Nova Scorpii 1994 (= GRO J1655-40). Mon. Not. R. Astron. Soc. 306, 89–94 (1999).