@article{10_21136_CMJ_1992_128332,
     author = {Merikoski, Jorma Kaarlo and Virtanen, Ari},
     title = {On elementary symmetric functions of the eigenvalues of the sum and product of normal matrices},
     journal = {Czechoslovak Mathematical Journal},
     pages = {193--198},
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {1992},
     doi = {10.21136/CMJ.1992.128332},
     mrnumber = {1179491},
     zbl = {0779.15002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1992.128332/}
}