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- Flat portions on the boundary of the indefinite numerical range of 3×3 matricesPublication . Teixeira, Ricardo Emanuel Cunha; Bebiano, Natália; Providência, João daWe focus on complex 3×3 matrices whose indefinite numerical ranges have a flat portion on the boundary. The results here obtained are parallel to those of Keeler, Rodman and Spitkovsky for the classical numerical range.