A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #0-9

Ivanov M.I., Stoykova K.H. (1994) Cretaceous/Tertiary boundary in the area of Bjala, Eastern Bulgaria - biostratigraphical results // Geologica Balcanica, 24, 6, Sofia, Decemb. Pp. 3-22.