| The 10 most recent references, extracted from 20 out of 20 sites, are listed below, the first one being the most recent. |
| Vieira, L. B. Thesis or Dissertation | |
| Lapa, M. R. L.; Silva, S. C. Thesis or Dissertation 1973 | |
| - Newspaper Article 2003 | |
| - Newspaper Article 2003 | |
| - Newspaper Article 2003 | |
| - Newspaper Article 2003 | |
| Gonçalves, I. Â. Thesis or Dissertation 2009 | |
| Gonçalves, E. A. Thesis or Dissertation 2009 | |
| Gomes, F. Thesis or Dissertation 2009 | |
| Gomes, W. Thesis or Dissertation 1989 | |