Trifonova, E. 1961: Liassic foraminifera assemblages from the Saranci, Breeza and Zimcvica
villages, district of Sofia. — Ann. dir. gen. rech, geol., 3, S. 269, Sofia.
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Trifonova, E. 1961: Liassic foraminifera assemblages from the Saranci, Breeza and Zimcvica
villages, district of Sofia. — Ann. dir. gen. rech, geol., 3, S. 269, Sofia