Foraminifera source request

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Chernykh, V. V. (1969). Новые силурийские фораминиферы рода Tolypammina восточного склона Урала - New Silurian foraminifera of the genus Tolypammina from the eastern slope of the Urals -. Тр. Свердл. горн. ин-та. 57: 15-21.