Hanzawa, S. (1939). On the occurrence of Acervulina, an Encrusting, Form of Foraminifera in the Jurassic Torinosu Limestone from the Kwanto Mountainland, Central Japan - 關東山地烏ノ巣石灰岩中に皮殻構造有孔虫Acervulinaの産出する事に就て. The Journal of the Geological Society of Japan. 46(547): 201-203 (in English with Japanese summary).
On the occurrence of Acervulina, an Encrusting, Form of Foraminifera in the Jurassic Torinosu Limestone from the Kwanto Mountainland, Central Japan - 關東山地烏ノ巣石灰岩中に皮殻構造有孔虫Acervulinaの産出する事に就て
The Journal of the Geological Society of Japan
46(547): 201-203 (in English with Japanese summary)