Okamura, H. & Semba, Y. (2009)
A novel statistical method for validating the periodicity of vertebral growth band formation in elasmobranch fishes. Canadian Journal of Fisheries and Aquatic Sciences, 66, 771–780
DOI: 10.1139/F09-039

Yokota, K. & Kiyota, M. & Okamura, H. (2009)
Effect of bait species and color on sea turtle bycatch and fish catch in a pelagic longline fishery. Fisheries Research, 97(1–2), 53–58
DOI: 10.1016/j.fishres.2009.01.003