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Kojumdgieva, E. (1960). Paleontolozhko i biostratigrafsko proychbahe na dolniya meot v severozapadna Bulgariya [Paleontological and biostratigraphic projection of the lower Maeotian in northwestern Bulgaria]. Godishnik na Upravlenieto za geolozhki prouchvaniya. 11: 139-155.
Kojumdgieva, E. (1960). Paleontolozhko i biostratigrafsko proychbahe na dolniya meot v severozapadna Bulgariya [Paleontological and biostratigraphic projection of the lower Maeotian in northwestern Bulgaria]. Godishnik na Upravlenieto za geolozhki prouchvaniya. 11: 139-155.
