Template:Niko & Ikebe, 1988
- Niko, S. & Ikebe, N. 1988. Fisherites, a receptaculitid from the Middle Ordovician of Pyongyang Coal-field. Transactions and Proceedings of the Palaeontological Society of Japan, New Series 149: 371–377. DOI: 10.14825/prpsj1951.1988.149_371