@article{nachtrieb_1902, 
  title={Leitfaden fur das zoologische Praktikum}, 
  volume={16}, 
  DOI={10.1126/science.16.402.431-a}, 
  number={402}, 
  publisher={American Association for the Advancement of Science (AAAS)}, 
  author={NACHTRIEB}, 
  year={1902}, 
  month={Sep}
  }