@article{hopkins_krause_calgary_calgary_2007, 
  title={Penetrative calcretes and their stratigraphic implications: Comment and Reply}, 
  DOI={10.11575/prism/35052}, 
  publisher={Geological Society of America}, 
  author={Hopkins, John C. and Krause, Federico F. and Calgary and Calgary}, 
  year={2007}, 
  month={May}
  }