@inproceedings{ad2012,
 author = {A. Radul and
           B. A. Pearlmutter and
           J. M. Siskind},
 title = {{AD} in {F}ortran: Implementation via Prepreprocessor},
 booktitle = {Proceedings of the International Conference on Algorithmic
              Differentiation (AD)},
 pages = {273-284},
 location = {Fort Collins, CO},
 day = {23--27},
 month = jul,
 year = 2012,
 url = {http://engineering.purdue.edu/~qobi/papers/ad2012.pdf}}