Free Access
| Number | Reference | Number | Reference |
| 42 | Sánchez & González-Serrano (2003) | 52 | Wright et al. (1998) |
| 43 | Barkhouse & Hall (2001) | 53 | Carballo et al. (1998) |
| 44 | Snellen et al. (1996) | 54 | Sanders et al. (1988) |
| 45 | Bloom et al. (1994) | 55 | Padovani et al. (2006) |
| 46 | González-Pérez et al. (2001) | 56 | Puschell et al. (1982) |
| 47 | Jarrett et al. (2003) | 57 | Villani & di Serego Alighieri (1999) |
| 48 | Skrutskie et al. (2003) | 58 | Xie et al. (1998) |
| 49 | de Vries et al. (1998) | 59 | Golombek et al. (1988) |
| 50 | Lilly et al. (1985) | 60 | Knapp et al. (1990) |
| 51 | Heckman et al. (1983) | 61 | Kotilainen et al. (2005) |
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