info:oai:pure.iiasa.ac.at:13592info:ofi/fmt:xml:xsd:journalKurzhanskiA.Kurzhanski, A.SugimotoK.Sugimoto, K.ValyiI.Valyi, I.18January 199408906327Guranteed state estimation for dynamical systems: Ellipsoidal techniquesInternational Journal of Adaptive Control and Signal Processing85-101article