@article{1077469447,
author = {Bush, K. A. and Olkin, I.},
title = {Extrema of functions of a real symmetric matrix in terms of
eigenvalues},
journal = {Duke Math. J.},
volume = {28},
number = {1},
year = {1961},
pages = { 143-152},
language = {en},
url = {http://dml.mathdoc.fr/item/1077469447}
}
Bush, K. A.; Olkin, I. Extrema of functions of a real symmetric matrix in terms of
eigenvalues. Duke Math. J., Tome 28 (1961) no. 1, pp. 143-152. http://gdmltest.u-ga.fr/item/1077469447/