Carlos Areces Diego Figueira Santiago Figueira Sergio Mera Expressive Power and Decidability for Memory Logics. 56-68 2008 WoLLIC http://dx.doi.org/10.1007/978-3-540-69937-8_7 conf/wollic/2008 db/conf/wollic/wollic2008.html#ArecesFFM08