References

• Akujor C.E., Lüdke E., Browne I.W.A., et al., 1994, A&AS 105, 247 NASA ADS
• Aretxaga I., Boyle B.J., Terlevich R.J., 1995, MNRAS 275, L27 NASA ADS
• Aragón-Salamanca A., Baugh C.M., Kauffmann G., 1998, MNRAS, astro-ph/9801277 (in press)
• Bahcall J.N., Kirhakos S., Schneider D.P., 1995, ApJ 450, 486 NASA ADS
• Bahcall J.N., Kirhakos S., Saxe D.H., Schneider D.P., 1997, ApJ 479, 642 NASA ADS
• Barthel P.D., 1989, ApJ 336, 606 NASA ADS
• Bergeron J., Petitjean P., Durret F., 1989, A&A 213, 61 NASA ADS
• Block D.L., Stockton A., 1991, AJ 102, 1928 NASA ADS
• Boisson C., Durret F., Petitjean P., Bergeron J., 1994, A&A 285, 377 NASA ADS
• Boroson T.A., Oke J.B., Green R.F., 1982, ApJ 263, 32 NASA ADS
• Bremer M.N., Crawford C.S., Fabian A.C., Johnstone R.M., 1992, MNRAS 254, 614 NASA ADS
• Bridle A.H., Hough D.H., Lonsdale C.J., Burns J.O., Laing R.A., 1994, AJ 108, 766 NASA ADS
• Cavaliere A., Padovani P., 1989, ApJ 340, L5 NASA ADS
• Collin-Souffrin S., 1991, A&A 243, 5 NASA ADS
• Crawford C.S., Fabian A.C., 1989, MNRAS 239, 219 NASA ADS
• Dennet-Thorpe J., Bridle A.H., Scheuer P.A.G., Laing R.A., Leahy J.P., 1997, MNRAS 289, 753 NASA ADS
• Disney M.J., Boyce P.J., Blades J.C., 1995, Nat 376, 150 NASA ADS
• Durret F., 1989, A&AS 81, 253 NASA ADS
• Durret F., 1990, A&A 229, 351 NASA ADS
• Durret F., Pécontal E., Petitjean P., Bergeron J., 1994, A&A 291, 392 NASA ADS
• Ellingson E., Green R.F., Yee H.K.C., Kinman T.D., 1989, AJ 97, 1539 NASA ADS
• Ellingson E., Green R.F., Yee H.K.C., 1991a, ApJ 378, 476 NASA ADS
• Ellingson E., Yee H.K.C., Green R.F., 1991b, ApJS 76, 455 NASA ADS
• Ellingson E., Yee H.K.C., 1994, ApJS 92, 33 NASA ADS
• Ellingson E., Yee H.K.C., Bechtold J., Dobrzycki A., 1994, AJ 107, 1219 NASA ADS
• Fabian A.C., Crawford C.S., Johnstone R.M., Allington-Smith J.R., Hewett P.C., 1988, MNRAS 235, 13P
• Gower A.C., Hutchings J.B., 1984, AJ 89, 1658 NASA ADS
• Green R.F., Yee H.K.C., 1984, ApJS 54, 495 NASA ADS
• Gunn J.E., 1971, ApJ 164, L113 NASA ADS
• Hall P.B., Green R.F., 1998, astro-ph/9806151
• Heckman T.M., Lehnert M.D., Miley G.K., van Breugel W., 1991, ApJ 381, 373 NASA ADS
• Heckman T.M., Chambers K.C., Postman M., 1992, ApJ 391, 39 NASA ADS
• Hes R., Barthel P.D., Fosbury R.A.E., 1996, A&A 313, 423 NASA ADS
• Hintzen P., Boeshaar G.O., Scott J.S., 1981, ApJ 246, L1
• Hintzen P., Ulvestad J., Owen F., 1983, AJ 88, 709 NASA ADS
• Hintzen P., 1984, ApJS 55, 533 NASA ADS
• Hintzen P., Stocke J., 1986, ApJ 308, 540 NASA ADS
• Hintzen P., Romanishin W., 1986, ApJ 311, L1 NASA ADS
• Hooper E.J., Impey C.D., Foltz C.B., 1997, ApJ 480, L95 NASA ADS
• Hutchings J.B., Crampton D., Campbell B., Duncan D., Glendenning B., 1984, ApJS 55, 319 NASA ADS
• Hutchings J.B., 1987, ApJ 320, 122 NASA ADS
• Hutchings J.B., Johnson I., Pyke R., 1988, ApJS 66, 361 NASA ADS
• Hutchings J.B., Crampton D., 1990, AJ 99, 37 NASA ADS
• Hutchings J.B., McClure R.D., 1990, PASP 102, 48 NASA ADS
• Hutchings J.B., Neff S.G., 1990, AJ 99, 1715 NASA ADS
• Hutchings J.B., Neff S.G., 1992, AJ 104, 1 NASA ADS
• Hutchings J.B., 1992, AJ 104, 1311
• Hutchings J.B., Dewey A., Chaytor D., et al., 1998, PASP 110, 111 NASA ADS
• Jannuzi B., Bahcall J.N., Bergeron J., et al., 1998, astro-ph/9805148
• Jorsäter S., Lindblad P.O., Boksenberg A., 1984, A&A 140, 288 NASA ADS
• Kirhakos S., Sargent W.L.W., Schneider D.P., et al., 1994, PASP 106, 646 NASA ADS
• Krempec-Krygier J., Krygier B., Walentinowicz G., 1998, A&A 334, 427 NASA ADS
• Le Brun V., Bergeron J., Boissé P., 1996, A&A 306, 691 NASA ADS
• Mantovani F., Junor W., Fanti R., et al., 1992, MNRAS 257, 353 NASA ADS
• Mantovani F., Junor W., Fanti R., Padrielli L., Saikia D.J., 1997, A&AS 125, 573 NASA ADS
• McCarthy P.J., van Breugel W.J.M., Spinrad H., Djorgovski S.G., 1987, ApJ 321, L29 NASA ADS
• McLeod K.K., Rieke G.H., 1994a, ApJ 420, 58 NASA ADS
• McLeod K.K., Rieke G.H., 1994b, ApJ 431, 137 NASA ADS
• Miley G.K., Hartsuijker A.P., 1978, A&AS 34, 129 NASA ADS
• Petitjean P., Durret F., 1993, A&A 277, 380
• Petitjean P., Rauch M., Carswell R.F., 1994, A&A 291, 29 NASA ADS
• Robinson L.B., Wampler E.J., 1972, ApJ 171, L83 NASA ADS
• Rönnback J., van Groningen E., Wanders I., Örndahl E., 1996, MNRAS 283, 282 NASA ADS
• Stocke J.T., Burns J.O., Christiansen W.A., 1985, ApJ 299, 799 NASA ADS
• Stockton A., 1978, ApJ 223, 747 NASA ADS
• Stockton A., MacKenty J.W., 1987, ApJ 316, 584 NASA ADS
• Swarup G., Sinha R.P., Hilldrup K., 1984, MNRAS 208, 813 NASA ADS
• Taylor G.L., Dunlop J.S., Hughes D.H., Robson E.I., 1996, MNRAS 283, 930 NASA ADS
• Thuan T.X., Puschell J.J., 1989, ApJ 346, 34 NASA ADS
• Véron-Cetty M.-P., Woltjer L., 1990, A&A 236, 69 NASA ADS
• Véron-Cetty M.-P., Woltjer L., Roy A.L., 1991, A&A 246, L73 NASA ADS
• Wampler E.J., Baldwin J.A., Burke W.L., Robinson L.B., 1973, Nat 246, 204
• Wyckoff S., Wehinger P.A., Gehren T., 1981, ApJ 247, 750 NASA ADS
• Wyckoff S., Johnston K., Ghigo F., Rudnick L., Wehinger P., Boksenberg A., 1983, ApJ 265, 43 NASA ADS
• Yee H.K.C., Green R.F., Stockman H.S., 1986, ApJS 62, 681 NASA ADS