Kerstin Bauer Raffaella Gentilini Klaus Schneider A Uniform Approach to Three-Valued Semantics for µ-Calculus on Abstractions of Hybrid Automata. 38-52 2008 Haifa Verification Conference http://dx.doi.org/10.1007/978-3-642-01702-5_9 conf/hvc/2008 db/conf/hvc/hvc2008.html#BauerGS08