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Aspects of floral biology in three species of Potamogeton (Pondweeds). Philbric C L. The Michigan Botanist . 1983
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Population Biology of Plants. Harper J L. . 1997
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Implications of pollen/ovule ratios and pollen size for the reproductive biology of Potamogeton and autogamy in aquatic angiosperms. Philbrick C T,Anderson G J. Systematic Botany . 1988
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The Principles of Pollination Ecology (Third Edition). Faegri K,van der L Pijl. . 1979
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Wind pollination in aquatic angiosperms. Cook C D K. Annals of the Missouri Botanical Garden . 1988
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Pollen ovule ratios: A conservative indicator of breeding systems in flowering plants. Cruden R W. Evolution International Journal of Organic Evolution . 1977