| The 10 most recent references, extracted from 20 out of 20 sites, are listed below, the first one being the most recent. |
| Varotto, S. E. C. Thesis or Dissertation 1986 | |
| Varotto, S. E. C. Thesis or Dissertation 1997 | |
| Banon, G. J. F. Misc | |
| Souza, L. V. Thesis or Dissertation 2019 | |
| - Newspaper Article 2002 | |
| - Newspaper Article 2002 | |
| Vargas, M. M. Thesis or Dissertation | |
| - Newspaper Article 2002 | |
| - Newspaper Article 2002 | |