Swen Jacobs Viorica Sofronie-Stokkermans Applications of Hierarchical Reasoning in the Verification of Complex Systems. 39-54 2007 174 Electr. Notes Theor. Comput. Sci. 8 http://dx.doi.org/10.1016/j.entcs.2006.11.038 db/journals/entcs/entcs174.html#JacobsS07