(2) Wright et al. (1994). (3) Véron-Cetty & Véron (2003). (4) Bennett et al. (1986), Langston et al. (1990), Griffith et al. (1990, 1991). (5) Forkert & Altschuler (1987). (6) Kühr et al. (1981). (7) Roettgering et al. (1994). (8) Lorimer et al. (1995), Maron et al. (2000). (9) Kulkarni et al. (1990). |
