Foraminifera source request

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Leven, E. Y. (1965). О стратиграфическом значении рода Polydiexodina Dunbar et Skinner, 1931 - On stratigraphic implications of the genus Polydiexodina Dunbar and Skinner. Академия наук СССР Вопросы микропалеонтологии - Academy of Sciences USSR Questions of Micropaleontology. 9: 129-146.