10504 | | Biser - neue Weißwein-Rebsorte | BABRIKOV, D.; ZANKOV, Z.; TODOROV, I.; GEORGIEV, S. | Lozarstvo i Vinarstvo, Sofia 37 (4) 46-47 | 1988 | BISER | 46 |
10057 | | Biser - a new wine cultivar | ZANKOV, Z.; BABRIKOV, D.; GEORGIEV, S. | Rastenievodni-Nauki (Bulgaria) 26 (5) 73-77 | 1989 | BISER | 73 |
924 | | Ampelografia | ROYCHEV, V. | Academic Publishing Agricultural University | 2012 | BISER | 380, Fig. 168 |