| Publication Type: | Journal Article |
| Year of Publication: | 1855 |
| Authors: | E. Perris |
| Journal: | Mémoires de la Société royale des Sciences de Liège |
| Volume: | 10 |
| Pagination: | 253-280. |
| Publication Type: | Journal Article |
| Year of Publication: | 1855 |
| Authors: | E. Perris |
| Journal: | Mémoires de la Société royale des Sciences de Liège |
| Volume: | 10 |
| Pagination: | 253-280. |