@article{jfp2019,
 author = {O. Manzyuk and
           B. A. Pearlmutter and
           A. A. Radul and
           D. R. Rush and
           J. M. Siskind},
 title = {Perturbation Confusion in Forward Automatic Differentiation of
          Higher-Order Functions},
 journal = {Journal of Functional Programming (JFP)},
 volume = 29,
 number = {e12},
 pages = {1-24},
 month = sep,
 year = 2019,
 url = {http://engineering.purdue.edu/~qobi/papers/jfp2019.pdf}}