Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TANAKA N,Pollination of the genus Hydrilla (Hydrocharitaceae) by waterborne pollen grains. II. Air bubbles cause the male flower to surface,Ann Tsukuba Bot Gard,,,2003,22,,11-13,https://cir.nii.ac.jp/crid/1572261549975929728,