Foraminifera source request

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Lipina, O. A. (1977). К систематике и эволюции нижнекаменноугольных эндотирид - To the systematics and evolution of the Lower Carboniferous endothyrids. Академия наук СССР Вопросы микропалеонтологии - Academy of Sciences USSR Questions of Micropaleontology. 20: 3-20.