@incollection{21,
  title = {Linguistic Assessment Approach for Hierarchical Safety Analysis and Synthesis},
  author = {Luis Martínez and Jun Liu and J. B Yang and J Wang},
  year = {2008},
  publisher = {Springer},
  volume = {117},
  pages = {249-270},
  url = {http://www.springerlink.com/content/354551w01gk58105/fulltext.pdf},
  keywords = {incollection},
}