Estep, P. W. (September 2010). “Declining asexual reproduction is suggestive of senescence in hydra: comment on Martinez, D., "Mortality patterns suggest lack of senescence in hydra."”. 《Experimental Gerontology》 45 (9): 645–6. doi:10.1016/j.exger.2010.03.017. PMID20398746. S2CID35408542.
Estep, P. W. (September 2010). “Declining asexual reproduction is suggestive of senescence in hydra: comment on Martinez, D., "Mortality patterns suggest lack of senescence in hydra."”. 《Experimental Gerontology》 45 (9): 645–6. doi:10.1016/j.exger.2010.03.017. PMID20398746. S2CID35408542.
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Hydra보관됨 2013-12-25 - 웨이백 머신, Northern State University.
Estep, P. W. (September 2010). “Declining asexual reproduction is suggestive of senescence in hydra: comment on Martinez, D., "Mortality patterns suggest lack of senescence in hydra."”. 《Experimental Gerontology》 45 (9): 645–6. doi:10.1016/j.exger.2010.03.017. PMID20398746. S2CID35408542.