1. A methode of determining the fertilization rate in sea urchins;Hagström;Exptl. Cell Res,1954
2. Refertilization of partially fertilized sea urchin eggs;Hagström;Ibid,1959
3. Acceleration of the cleavage of sea urchin eggs by vital staining with neutral red;Kojima;Ibid,1960
4. Acceleration of certain protoplasmic changes in activated sea urchin eggs by vital staining with neutral red;Kojima;Acta Embryol. Morphol. Exp,1961
5. Cleavage of the sea urchin egg in which fertilization was interrupted and re-insemination was performed;Kojima;Zool. Mag. (Tokyo),1963