@inbook {82,
	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},
	month = {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},
	author = {Bekchiev, R.},
	editor = {Beron, P.}
}
@article {91,
	title = {Terrestrial cave invertebrates of the Vrachanska Planina Mountains},
	journal = {ZooNotes},
	volume = {Supplement 3},
	number = {Faunistic diversity of Vrachanski Balkan Nature Park},
	year = {2016},
	month = {2016},
	pages = {185-230},
	author = {Beron, P.}
}
@article {89,
	title = {Aper{\c c}u sur la composition, l{\textquoteright}origine et la formation de la faune cavernicole de la Stara planina occidentale (Bulgarie)},
	journal = {International Journal of Speleology},
	volume = {9},
	year = {1978},
	month = {1978},
	pages = {197-220},
	author = {Beron, P.}
}
@inbook {93,
	title = {The Invertebrate cave fauna of the Eastern Rhodopes (Bulgaria and Greece)},
	booktitle = {Biodiversity of Bulgaria 2: Biodiversity of Eastern Rhodopes (Bulgaria and Greece).},
	year = {2004},
	month = {2004},
	pages = {791-822},
	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},
	author = {Beron, P. and Petrov, B. and Stoev, P.},
	editor = {Beron, P. and Popov, A.}
}
@book {92,
	title = {Caves and Speleology in Bulgaria},
	year = {2006},
	month = {2006},
	pages = {600},
	publisher = {Pensoft Publishers, BFS \& NMNH},
	organization = {Pensoft Publishers, BFS \& NMNH},
	address = {Sofia},
	isbn = {954-642-241-X},
	author = {Beron, P. and Daaliev, T. and Jalov, A.}
}
@book {90,
	title = {Cave fauna of Bulgaria},
	year = {2015},
	month = {2015},
	pages = {436},
	publisher = {East-West},
	organization = {East-West},
	address = {Sofia},
	isbn = {978-619-152-712-0},
	author = {Beron, P.}
}
