@booklet {6777,
	title = {Permskaya sistema},
	howpublished = {Stratigrafiya SSSR},
	year = {1966},
	note = {Have Pelecypoda: 427-429; partial bibliography},
	publisher = {Nedra},
	address = {Moskva},
	keywords = {bakevellia, bakevelliidae, bivalvia, mollusca, Pteria, pteriidae, pterioidea, stratigraphy, taxonomy},
	author = {Likhariov, B. K.}
}
@booklet {1338,
	title = {Permskaya sistema},
	howpublished = {Stratigrafiya SSSR},
	year = {1966},
	publisher = {Nedra},
	address = {Moskva},
	keywords = {bakevellia, bakevelliidae, bivalvia, mollusca, Pteria, pteriidae, pterioidea, stratigraphy, taxonomy},
	author = {Likhariov, B. K.}
}
