12th annual Southeastern symposium on system theory. The 14th annual southeastern symposium on system theory. 18th southeastern Symposium on System Theory. Eighteenth Southeastern Symposium on System Theory The eighteenth southeastern Symposium on System Theory. Southeastern Symposium on System Theory. The 15th Southeastern Symposium on System Theory : The 16th Southeastern Symposium on System Theory : Southeastern Symposium on System Theory Southeastern Symposium on Systems Theory.