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Ivanova D., Lakova I., Pavlishina P., Koleva-Rekalova E. (2002) Joint biostratigraphy and lithofacies of Berriasian and Valanginian limestones from subsurface sections in NE Bulgaria // Geologica Balcanica, 32.2-4, Sofia, Decemb. Pp. 63-67.



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