Foraminifera source request

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Voytsekhovskaya, A. A. (1961). Представители семейства Endothyridae (Foraminifera) из нижнекаменноугольных отложений крайнего Севера - Representatives of the family Endothyridae (Foraminifera) from the Lower Carboniferous deposits of the extreme North. Труды НИИГА - Trudy NIIGA. 24: 16-45.