@article{thampson_howell_pitt_mclaughlin_1969, 
  title={The biological activity of retinoic acid in the domestic fowl and the effects of vitamin A deficiency on the chick embryo}, 
  volume={23}, 
  DOI={10.1079/bjn19690056}, 
  number={03}, 
  publisher={Cambridge University Press (CUP)}, 
  author={Thampson and Howell and Pitt and McLaughlin}, 
  year={1969}
  }