| Citation | Garthe, S., T. Freyer, O. Hüppop and D. Wölke 1999 Breeding Lesser Black-backed Gulls Larus graellsii and Herring Gulls Larus argentatus: coexistence or competition?. Seabirds Ardea 87(2):227-236. |
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| Ref. No. | 4304 |
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