The Black Grouse, Tetrao tetrix (L., 1758) (Tetraonidae, Aves), a disappeared species in Bulgaria (Paleolithic and Neolithic records). Boev, Z. Anthropozoologica, 25-26:643–646, 1997.
bibtex   
@article{boev_black_1997,
	title = {The {Black} {Grouse}, {Tetrao} tetrix ({L}., 1758) ({Tetraonidae}, {Aves}), a disappeared species in {Bulgaria} ({Paleolithic} and {Neolithic} records)},
	volume = {25-26},
	journal = {Anthropozoologica},
	author = {Boev, Z.},
	year = {1997},
	pages = {643--646},
}

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