@article{477f4a36faa14dc4a034cf7f1737fa7f,
title = "On the numerical range of some block matrices with scalar diagonal blocks",
abstract = "Several new verifiable conditions are established for matrices of the form (Formula presented.) to have the numerical range equal the convex hull of at most k ellipses. For k = 2, these conditions are also necessary, provided that the ellipses are co-centred.",
keywords = "Numerical range",
author = "Titas Geryba and Spitkovsky, {Ilya M.}",
note = "Funding Information: The results are partially based on the Capstone project of the first named author [TG] under the supervision of the second named author [IMS]. This work was supported in part by Faculty Research funding from the Division of Science and Mathematics, New York University Abu Dhabi. Publisher Copyright: {\textcopyright} 2020 Informa UK Limited, trading as Taylor & Francis Group. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
doi = "10.1080/03081087.2020.1749225",
language = "English (US)",
volume = "69",
pages = "772--785",
journal = "Linear and Multilinear Algebra",
issn = "0308-1087",
publisher = "Taylor and Francis Ltd.",
number = "5",
}