Hughes-Schrader, S. 1927 Origin and differentiation of the male and female germ cells in the hermaphrodite of Icerya purchasi (Coccidae).. Zeitschrift für Zellforschung und Mikroskopische Anatomie 6: 509-540.
Hughes-Schrader, S. 1927 Origin and differentiation of the male and female germ cells in the hermaphrodite of Icerya purchasi (Coccidae).. Zeitschrift für Zellforschung und Mikroskopische Anatomie 6: 509-540.