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Ken Ohnishi; Akihisha Takahashi; Hiroaki Tanaka; Takeo Ohnishi. Relationship between frequency of upside-down posture and space size around upside-down catfish, Synodontis nigriventris (англ.) // Biological Sciences in Space : journal. — 1996. — Vol. 10, no. 4. — P. 247—251. — doi:10.2187/bss.10.247. — PMID11540345.
K. Ohnishi; T. Yamamoto; A. Takahashi; H. Tanaka, M. Koyama, M. Masukawa, T. Ohnishi. Unique postural control of upside-down swimming catfish, Synodontis nigriventris, not affected by the change of gravity (англ.) // J Gravit Physiol : journal. — 2000. — Vol. 7, no. 2. — P. 97—108. — PMID12697555.