Protozoa as precursors of metazoa: German cell theory and its critics at the turn of the century.

@article{Richmond1989ProtozoaAP,
  title={Protozoa as precursors of metazoa: German cell theory and its critics at the turn of the century.},
  author={Marsha L. Richmond},
  journal={Journal of the history of biology},
  year={1989},
  volume={22 2},
  pages={243-76}
}

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