Foraminifera source request

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Serova, M. Y. (1961). Вид Trochammina vitrea Serova, sp. nov., его палеоэкология и стратиграфическое значение - The species Trochammina vitrea Serova, sp. nov., its paleoecology and stratigraphic significance. Академия наук СССР Вопросы микропалеонтологии - Academy of Sciences USSR Questions of Micropaleontology. 5: 69-82.