@article{eisen_1900, 
  title={A PRELIMINARY ACCOUNT OF THE SPERMATOGENESIS OF BATRACHOSEPS ATTENUATUS, POLYMORPHOUS SPERMATOGONIA, AUXOCYTES AND SPERMATOCYTES}, 
  DOI={10.2307/1535754}, 
  publisher={Ginn & Company}, 
  author={Eisen, Gustav}, 
  year={1900}
  }