E. Oren, M. Völkel, J. Breslin, and S. Decker. Database and Expert Systems Applications, 4080/2006, page 509-518. Springer Berlin / Heidelberg, (September 2006)
E. Oren, M. Völkel, J. Breslin, and S. Decker. Database and Expert Systems Applications, 4080/2006, page 509-518. Springer Berlin / Heidelberg, (September 2006)