Phenotypic characterization, taxonomic rank and phylogenetic relationships of Armenian Gull Larus armenicus
Dorit Liebers & Andreas J. Helbig
published: Limicola 13-6, 1999 (in German, with English summary)
Fig 8: Larus armenicus male at Tuz Golu, Turkey, May 1999. Picture: Andreas J. Helbig.
The bill is larger than in females. Restricted black marking on the upper mandible and dark iris (representative for 44% of the Tuz and Van Golu birds).

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