@article {1097,
	title = {Terrestrial cave invertebrates of the Vrachanska Planina Mountains},
	journal = {ZooNotes},
	volume = {Supplement 3},
	number = {Faunistic diversity of Vrachanski Balkan Nature Park},
	year = {2016},
	pages = {185-230},
	author = {Beron, P.}
}
@book {1095,
	title = {Cave fauna of Bulgaria},
	year = {2015},
	pages = {436},
	publisher = {East-West},
	organization = {East-West},
	address = {Sofia},
	isbn = { 9786191527120},
	author = {Beron, P.}
}
@book {1096,
	title = {Caves and Speleology in Bulgaria},
	year = {2006},
	pages = {600},
	publisher = {Pensoft Publishers, BFS \& NMNH},
	organization = {Pensoft Publishers, BFS \& NMNH},
	address = {Sofia},
	isbn = {954642241X},
	author = {Beron, P. and Daaliev, T. and Jalov, A.}
}
@inbook {6,
	title = {A study of the Pselaphinae (Coleoptera, Staphylinidae) in the Rhodope Mountains (Bulgaria)},
	booktitle = {Biodiversity of Bulgaria 4. Biodiversity of Western Rhodopes (Bulgaria and Greece) II.},
	year = {2011},
	pages = {267{\textemdash}278},
	publisher = {Pensoft Publishers \& National Museum of Natural History, Bulgarian Academy of Sciences},
	organization = {Pensoft Publishers \& National Museum of Natural History, Bulgarian Academy of Sciences},
	address = {Sofia},
	abstract = {<br />
},
	author = {Bekchiev, R.},
	editor = {Beron, P.}
}
