@inproceedings {1442,
	title = {On State Estimation of Timed Choice-Free Petri Nets},
	booktitle = {18th IFAC World Congress},
	year = {2011},
	month = {09/2011},
	publisher = {IFAC},
	organization = {IFAC},
	address = {Milan, Italy},
	author = {X. Wang and Mahulea, Cristian and J. Julvez and M. Silva}
}

