Elena Fersman Pavel Krcál Paul Pettersson Wang Yi 0001 Task automata: Schedulability, decidability and undecidability. 1149-1172 2007 205 Inf. Comput. 8 http://dx.doi.org/10.1016/j.ic.2007.01.009 db/journals/iandc/iandc205.html#FersmanKPY07