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| Author | : | Pamouktchiev, A. |
| Year of publication | : | 1977 |
| Title | : | Hippurites tzankovi sp. n. du Maestrichtien de la région de Breznik (Bulgarie de l'Ouest). |
| Journal | : | Spisanie na blgarskoto geologichesko Druzhestvo |
| Vol/No/Pages/Plates | : | 37: 221-223, 1 fig. |
| Published in | : | Sofija |