@article {Sapunov1985,
	title = {Stratigraphy of the Callovian and Upper Jurassic rocks in south-western Bulgaria},
	journal = {Geologica Balcanica},
	volume = {15},
	number = {2},
	year = {1985},
	pages = {3{\textendash}61},
	keywords = {JS, TIP},
	author = {Sapunov, I and Tchoumatchenco, P and Dodekova, L and Bakalova, D}
}
@article {Lefeld1986,
	title = {Upper Jurassic-Lowermost Cretaceous sequences in the Inner Carpathians (Poland) and in the Balkanids (Bulgaria) {\textendash} a comparison},
	journal = {Geologica Balcanica},
	volume = {16},
	year = {1986},
	pages = {87{\textendash}97},
	keywords = {JS, TIP},
	author = {Lefeld, Jerzy and Sapunov, I and Tchoumatchenco, P and Bakalova, D and Dodekova, L}
}
@article {Dabowski2002,
	title = {Structure and alpine evolution of Bulgaria},
	journal = {Geologica Balcanica},
	volume = {32},
	year = {2002},
	pages = {9{\textendash}12},
	keywords = {JS, TIP},
	author = {Dabowski, C and Boyanov, I and Khrischev, K H and Nikolov, T and Sapunov, I and Yanev, Y and Zagorchev, I}
}
