@inproceedings {IPSiRe03b,
	title = {Unforced Continuous Petri Nets and Positive Systems},
	booktitle = {Lecture Notes in Control and Information Sciences},
	year = {2003},
	publisher = {Springer-Verlag},
	organization = {Springer-Verlag},
	author = {M. Silva and L. Recalde},
	editor = {L.A. Santis and L. Farina}
}

