A new concept for block operator matrices:the quadratic numerical range
Heinz LangerInstitut für Analysis und Technische Mathematik, Technische Universität Wien, A-1040 Wien, AustriaA. MarkusDepartment of Mathematics, Ben-Gurion University of the Negev, Beer Sheva 84105, IsraelV. MatsaevSchool of Mathematical Sciences, Tel Aviv University, Ramat Aviv 69978, IsraelChristiane TretterDepartment of Mathematics and Computer Science, University of Leicester, Leicester LE1 7RH, UK
2001en
ABI
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Cited by 30 references