Pencils of real symmetric matrices and the numerical range.
Aequationes mathematicae, Tome 17 (1978), pp. 91-103.

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@article{AM2_1978__17_136724,
     author = {Marvin Marcus},
     title = {Pencils of real symmetric matrices and the numerical range.},
     journal = {Aequationes mathematicae},
     pages = {91--103},
     publisher = {mathdoc},
     volume = {17},
     year = {1978},
     zbl = {0386.15010},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__17_136724/}
}
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Marvin Marcus. Pencils of real symmetric matrices and the numerical range.. Aequationes mathematicae, Tome 17 (1978), pp. 91-103. http://geodesic.mathdoc.fr/item/AM2_1978__17_136724/