*Midorikawa, S., Shutoh, K. & Shiga, T. 2020. An easy method of identifying herbarium specimens of Najas minor and N. oguraensis (Hydrocharitaceae). Acta Phytotax. Geobot. 71(1): 55-63.
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*Midorikawa, S., Shutoh, K. & Shiga, T. 2020. An easy method of identifying herbarium specimens of ''Najas minor'' and ''N. oguraensis'' (Hydrocharitaceae). Acta Phytotax. Geobot. 71(1): 55-63.