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