Ivo Marek Petr Mayer Iterative Aggregation/Disaggregation Methods for Computing Some Characteristics of Markov Chains. 68-80 2001 conf/lssc/2001 LSSC http://link.springer.de/link/service/series/0558/bibs/2179/21790068.htm db/conf/lssc/lssc2001.html#MarekM01