@article{haughton_1869, 
  title={On Some Elementary Principles in Animal Mechanics.--No. II}, 
  volume={18}, 
  DOI={10.1098/rspl.1869.0007}, 
  number={114-122}, 
  publisher={The Royal Society}, 
  author={Haughton}, 
  year={1869}, 
  month={Jan}
  }