Positive realness is not equivalent to external positivity Egileak: De La Sen, M. Urtea: 2009 Non argitaratua: 2009 IEEE International Conference on Control and Automation, ICCA 2009, art. no. 5410195 Hasierako orria - Amaierako orria: 948 - 953 Informazio gehigarria http://www.scopus.com/inward/record.url?eid=2-s2.0-77950395224&partnerID=40&md5=f2a91070f682d5b8c2e9f260076b10e0