| Autori | Titlu | Publicatia | An aparitie |
| DRAGASTAN, O., RICHER, D. | A SEQUENCE FROM LATE TRIASSIC SHALLOW WATER CARBONATES TO JURASSIC BASINAL RADIOLARITES | BOCHUM UNIV | 1999 |
| DRAGASTAN, O., RICHER, D. | JURASSIC-CRETACEOUS CACAREOUS ALGAE OF THE TRANSYLVANIDES, INNER DACIDES AND MOESIAN PLATFORM | REVISTA ESPANOLA DE MICROPALEONTOLOGIA | 1999 |
| DRAGASTAN, O., RICHER, D. | NEW LATE TRIASSIC CALCAREOUS ALGAE FROM HYDRA, GREECE | STUDIA UNIVERSITATIS | 2000 |