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Gould-Somero, M, Holland LZ.  1975.  Oocyte differentiation in Urechis caupo (Echiura)-- A Fine-structural Study. Journal of Morphology . 147(4):475-505.   10.1002/jmor.1051470407  
Holland, ND, Holland LZ.  1969.  Annual cycles in germinal and non-germinal cell pupulations in the gonads of the sea urchin Psammechinus microtuberculatus. Pubblicazione della Stazione di Zoologica di Napoli . 37:394-404.