Foraminifera source request

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Zhang, B. (1994). 西藏阿里地区白垩纪圆笠虫类化石 - Cretaceous larger Foraminifera Orbitolinids from Ngari, Western Xizang (Tibet). 西藏日土地区二叠纪、侏罗纪、白垩纪地层及古生物. 南京:南京大学出版社 - Nanjing Institute of Geology and Palaeontology, Academia sinica. [1991]: 68-87.