Aidan Harding Mark Ryan Pierre-Yves Schobbens Approximating ATL<sup>*</sup> in ATL. 289-301 2002 conf/vmcai/2002 VMCAI http://link.springer.de/link/service/series/0558/bibs/2294/22940289.htm db/conf/vmcai/vmcai2002.html#HardingRS02