@inproceedings{hills-klint-vinju-2013-issta,
  author    = {Mark Hills and Paul Klint and Jurgen J. Vinju},
  title     = "{An Empirical Study of PHP Feature Usage: A Static Analysis Perspective}",
  booktitle = {Proceedings of the 2013 International Symposium on Software Testing and Analysis (ISSTA 2013)},
  publisher = {ACM},
  year      = {2013},
  pages     = {325--335},
  doi       = {10.1145/2483760.2483786},
}