Foraminifera source request

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Pronina, T. V., and B. I. Chuvashov. (1965). Эволюционное развитие, систематика, палеоэкология и стратиграфическое значение семейства Parathuramminidae - Evolutionary development, systematics, paleoecology and stratigraphic significance of the family Parathuramminidae. Академия наук СССР Вопросы микропалеонтологии-Academy of Sciences USSR Questions of Micropaleontology. 9: 71-82.