Vadim Ermolayev Natalya Keberle Wolf-Ekkehard Matzke Richard Sohnius Fuzzy Time Intervals for Simulating Actions. 429-444 2008 UNISCON http://dx.doi.org/10.1007/978-3-540-78942-0_42 conf/ista/2008 db/conf/ista/uniscon2008.html#ErmolayevKMS08